Making and Preserving Squashes: Methods and Ingredients

Fruit squash is one of the most popular preserved beverages across India and many other countries. It is a concentrated, sweetened fruit drink that you dilute with water before serving – making it a convenient, shelf-stable product that captures the flavour of fresh fruits all year round. Whether it’s a tangy lemon squash in peak summer or a rich mango squash enjoyed with chilled water, understanding how squash is prepared and preserved is essential for anyone studying horticulture produce processing or looking to start a small-scale food business.

What exactly is a fruit squash? 🔗

A fruit squash is a non-alcoholic concentrated syrup made primarily from fruit juice or pulp, sugar, water, citric acid, and a permitted chemical preservative. It is always diluted with water – typically in a 1:3 ratio (one part squash to three parts water) – before drinking. This differentiates it from ready-to-serve (RTS) beverages, which need no dilution, and from cordials, which are clarified versions with no suspended pulp.

According to India’s Fruit Products Order (FPO) and FSSAI regulations, a fruit squash must contain a minimum of 25% fruit juice or pulp and at least 40% total soluble solids (TSS). The acidity generally ranges between 1.0% and 1.5%, though it should not exceed 3.5%. The preservative limit is set at a maximum of 350 ppm sulphur dioxide (SO₂) or 600 ppm sodium benzoate.

Key ingredients used in squash preparation 🔗

Every fruit squash relies on a handful of core ingredients, each playing a specific role in flavour, stability, and shelf life.

Fruit juice or pulp 🔗

This is the base of the squash and contributes the primary flavour, colour, and nutritional value. Commonly used fruits include lime, lemon, orange, mango, pineapple, and guava. Coloured fruits like jamun, passion fruit, raspberry, strawberry, and grapefruit are also used, though the choice of preservative differs for these (more on that below). The juice is typically extracted using mechanical presses, screw-type extractors, or fruit pulpers, depending on the fruit type.

Sugar 🔗

Cane sugar is the standard sweetener. It serves two purposes: it provides sweetness and helps in preservation by raising the total soluble solids. Sugar is usually dissolved in water first to make a syrup, which is then mixed with the fruit juice. A typical recipe for preparing 10 litres of squash may use around 4 kg of sugar, depending on the TSS of the juice.

Citric acid 🔗

Citric acid is added at roughly 1% concentration in the final product. It balances the sweetness with a pleasant tartness, lowers the pH to make the product less hospitable to microbial growth, and helps maintain the colour of the squash over time. For fruits that are naturally quite acidic, the amount of additional citric acid may be reduced.

Preservatives 🔗

Since squash is not heat-processed like canned juices, it relies on chemical preservatives for long-term storage. The two primary preservatives permitted under Indian food regulations are:

Potassium metabisulphite (KMS) – This is the most common preservative used in squash made from citrus and light-coloured fruits. When added to the juice, KMS reacts with the fruit’s natural acid and releases sulphur dioxide (SO₂), which acts as an antimicrobial and antioxidant agent. It is particularly effective against moulds and bacteria. However, SO₂ has a bleaching effect, so it should not be used in naturally coloured juices like jamun, pomegranate, phalsa, or strawberry. It should also be avoided if the squash is to be stored in tin containers, as SO₂ reacts with tin to produce undesirable compounds.

Sodium benzoate – This is the salt of benzoic acid and is readily soluble in water, making it easy to mix. It is the preferred preservative for deeply coloured fruit squashes where SO₂ would cause colour loss. As per the FPO standards, the permitted limit is up to 600 ppm of sodium benzoate. It works effectively against yeasts in particular.

Colouring and flavouring agents 🔗

Permitted food-grade colours are sometimes added to enhance or restore the visual appeal of the squash, especially when the natural colour fades during processing. Similarly, natural or approved flavouring agents – such as peel emulsions or essential oils – may be added to boost the fruit aroma. For instance, in orange squash, the peel emulsion of 2-4 oranges per 100 oranges processed is often added to enhance flavour.

Step-by-step process of preparing fruit squash 🔗

The preparation of squash follows a systematic process, from fruit selection to bottling. Here is how it is done:

1. Selection and sorting of fruits 🔗

Start with fully ripe, fresh fruits that are free from disease, damage, or decay. Overripe or unripe fruits will negatively affect the flavour and quality of the final squash. Sorting removes any unsuitable fruits from the batch.

2. Washing 🔗

Fruits are washed thoroughly with clean water to remove dirt, dust, and any surface residues. In commercial processing, a dilute hydrochloric acid solution (about 0.5% HCl) may be used to remove pesticide residues, followed by rinsing with clean water.

3. Juice extraction 🔗

The method of juice extraction depends on the type of fruit. Citrus fruits like oranges and lemons are halved and pressed using mechanical squeezers or rosing machines. Soft fruits like mangoes are pulped using fruit pulpers. Hard fruits like pineapple are peeled, pulped, and pressed. The extracted juice or pulp is then strained through a muslin cloth or fine mesh sieve to remove seeds, fibres, and other suspended particles.

4. Preparation of sugar syrup 🔗

Sugar is dissolved in water and heated to make a syrup. Citric acid is added during this step. The syrup is boiled briefly and then strained through fine muslin cloth to remove any impurities. It is then allowed to cool completely before mixing with the juice – this is important because adding hot syrup to juice can destroy vitamins and alter the flavour.

5. Mixing juice with syrup 🔗

The strained fruit juice is combined with the cooled sugar syrup in proportions calculated to meet the required standards of 25% juice content and the target TSS. For a standard batch of 10 litres of squash, the typical formulation calls for 2.5 litres of juice, approximately 4.14 kg of sugar, 100 g of citric acid, and 9 g of KMS (or the equivalent amount of sodium benzoate).

6. Addition of preservatives 🔗

The preservative – either KMS or sodium benzoate – is first dissolved in a small amount of water or warm syrup. It is then added to the squash mixture and stirred thoroughly to ensure even distribution. This is a critical step; uneven preservative distribution can lead to spoilage in parts of the batch.

7. Addition of colour and flavour 🔗

If the natural colour of the juice has faded, a permitted food-grade colour is added. Flavouring agents such as fruit essence or peel oil are also incorporated at this stage to intensify the aroma.

8. Bottling and storage 🔗

The finished squash is filled into pre-sterilised glass bottles, leaving approximately 1.2 to 2.5 cm of headspace at the top. Bottles are sealed tightly using crown corks or pilfer-proof (PP) caps. Proper sterilisation of bottles before filling is essential – this is typically done by immersing glass bottles in boiling water for 8-10 minutes and allowing them to dry completely. The sealed bottles are stored in a cool, dry place away from direct sunlight.

Calculating the formulation for squash 🔗

Getting the proportions right is key to meeting food safety standards and ensuring consistent product quality. Here is a simplified example for preparing 10 litres of squash, based on the formulation outlined by standard food processing guidelines:

Step 1: Calculate the required juice volume. At 25% juice content: (25/100) × 10 = 2.5 litres of juice.

Step 2: Measure the TSS of the extracted juice using a refractometer (assume TSS is 30%). Total solids from juice = 0.30 × 2.5 = 0.75 kg.

Step 3: For a final TSS of 50% in the product, the total solids needed = 0.50 × 10 = 5.0 kg. So, the additional solids to be added = 5.0 − 0.75 = 4.25 kg.

Step 4: Deduct the weight of citric acid (100 g at 1%) and KMS (9 g for 350 ppm SO₂). The sugar to add = 4.25 − (0.1 + 0.009) = approximately 4.14 kg.

Step 5: The remaining volume is made up with water: 10 − (2.5 + volume occupied by sugar and acid) = approximately 3.25 litres of water.

This type of calculation ensures that the squash meets the regulatory requirements for juice percentage, TSS, and preservative concentration.

Role of preservatives in shelf life 🔗

Unlike pasteurised beverages that rely on heat treatment to kill microorganisms, squash depends entirely on chemical preservation for its stability. Understanding how each preservative works helps in choosing the right one for different fruits.

Sulphur dioxide (from KMS) is effective against mould spores and bacteria, and also acts as an antioxidant. It helps retain ascorbic acid and carotene content in the product and prevents non-enzymatic browning. With good hygienic practices during preparation, the SO₂ concentration can be safely reduced to around 250 ppm.

Sodium benzoate is more effective against yeasts than moulds. It is commonly preferred for squashes made from berries and other intensely coloured fruits because it does not bleach the product. Being water-soluble, it is also easier to incorporate evenly into the mixture.

Common defects and how to prevent them 🔗

Even with careful preparation, certain defects can occur in stored squash. Recognising and preventing these issues is important for both home-scale and commercial producers.

Fermentation and off-flavours 🔗

A cloudy appearance, gas bubbles, or sour/alcoholic smell indicates microbial fermentation. This typically results from insufficient preservative levels, poor hygiene during preparation, or contaminated raw materials. The solution is to maintain proper preservative concentrations and ensure all equipment and bottles are thoroughly sterilised.

Colour fading or browning 🔗

Browning can occur due to oxidation or exposure to excessive heat. Maintaining adequate citric acid levels helps, as does avoiding prolonged exposure of the juice to air during processing. Using stainless steel or aluminium equipment instead of iron or copper vessels is also critical – metals like iron and copper react with fruit acids and cause blackening of the product.

Sugar crystallisation 🔗

If the sugar concentration is too high or there are significant temperature fluctuations during storage, sugar crystals may form in the squash. Keeping the TSS within the recommended range (40-50%) and storing bottles at a stable, cool temperature prevents this problem. Adding a small amount of citric acid during syrup preparation also helps by inverting some of the sucrose, which discourages crystal formation.

Settling or sedimentation 🔗

Suspended pulp particles may settle at the bottom over time. Thorough straining during preparation and shaking the bottle before use are simple remedies. In commercial production, homogenisation of the mixture can improve uniformity.

Equipment and hygiene considerations 🔗

The quality and safety of the final squash product depend heavily on the equipment and hygiene practices used during preparation.

All equipment must be rust-proof and acid-proof. Stainless steel is the best choice. Copper and iron vessels must be strictly avoided because they react with fruit acids and cause discolouration, metallic flavours, and degradation of vitamins. Even the ladles, spoons, and measuring vessels should be made of non-corrodible materials.

Extracted juice should not be exposed to air for prolonged periods, as oxidation spoils the colour, taste, and aroma, and reduces vitamin content. Processing should be done as quickly as possible in a clean, well-ventilated area.

Bottles and caps must be sterilised before filling. Glass containers are preferred for their inert nature and impermeability. After filling, bottles should be sealed immediately to prevent contamination.

Popular fruit squash varieties in India 🔗

India has a rich tradition of squash-making, driven by the wide availability of tropical and subtropical fruits. Some of the most commercially produced varieties include lemon squash, mango squash, orange squash, and pineapple squash. Regional favourites also include guava squash in parts of western India and mixed fruit squashes that combine two or more fruits. Spiced versions, sometimes called fruit appetisers, add ingredients like black pepper, cumin, cardamom, ginger, and mint extract to the basic squash formula.

Each fruit brings its own processing considerations. Citrus fruits yield clear juice that works well with KMS. Mango yields a thicker pulp that requires more thorough straining. Deeply coloured fruits like jamun or strawberry need sodium benzoate instead of KMS to preserve their vibrant colour.

Squash vs. other fruit beverages 🔗

It is useful to understand how squash compares with other fruit beverage products:

Ready-to-serve (RTS) beverages contain at least 10% fruit juice and 10% TSS, are preserved by pasteurisation or low doses of preservatives (70 ppm SO₂ or 120 ppm benzoic acid), and need no dilution before drinking.

Fruit nectar has at least 20% juice and 15% TSS, is preserved by heat processing, and does not allow Class II preservatives like SO₂ or benzoic acid under Indian food law.

Cordial is similar to squash in composition (25% juice, 30% TSS) but is completely clear – all pulp and suspended matter are removed, making it sparkling in appearance.

Fruit crush has the same juice percentage as squash but a higher TSS of 55%, making it thicker and more concentrated.

Fruit syrup is the most concentrated of all, with 65% TSS and at least 25% juice content.

What do you think? If you were to start making fruit squash at home or for a small business, which fruit would you choose and why? How would you decide between using KMS and sodium benzoate as your preservative, considering the fruit’s natural colour and your target market?

References

1. https://www.horticultureguruji.in/unfermented-beverages/
2. https://www.horticultureguruji.in/preparation-of-squash/
3. http://www.eagri.org/eagri50/HORT381/pdf/lec15.pdf
4. https://en.wikipedia.org/wiki/Squash_(drink)
5. http://www.agritech.tnau.ac.in/postharvest/fpo_spec.html
6. https://www.agriculturejournal.org/volume10number3/preparation-and-evaluation-of-processed-products-squash-syrup-and-ready-to-serve-from-seedless-lemon-citrus-limon-burm-fruits/
7. https://foodsafety.institute/food-laws-standards/quality-safety-fruit-products-order-1955/