This is a recipe for a mixed fruit (ready to drink) juice, using pineapple and passion fruit. Passion fruit has a very strong, sharp flavor, which complements pineapple juice as this is rather weak in taste and color. The yield of juice from whole passion fruit is approximately 30 35% and the juice has a pH from 2.6 3.0. The larger fruits give a better yield. The yield for pineapple is approximately 30% and the pH of the juice varies 3.4 4.1. The Mauritius variety has the best flavored juice, but the Kewpine variety gives better yields. Pineapples contain the enzyme Bromelain. This is a proteolytic enzyme (breaks down proteins) which can cause problems for peoples’ hands which are in contact with the juice for long periods during cutting operations. Gloves should therefore be worn and washed each day.
Recipe
Sugar 17%
Passion fruit juice 3%
Pineapple juice 9%
Water 71%
Coloring ?%
Sodium benzoate 0.0188% (188ppm)
Benzoic acid is a preservative, which is added to the juice in the form of the salt sodium benzoate. (188ppm of sodium benzoate will give 160ppm of Benzoic acid.) Preservatives are controlled by legal limits, these limits vary from country to country and should be checked at your Bureau of Standards.
Method
Wash whole passion fruits in clean water and discard any bad fruits.
Cut fruits in half with a stainless steel knife and scoop out pulp with stainless steel spoon.
Extract the juice from the pulp by liquidizing the pulp at a very low speed (this stops the chipping of the seeds, which turn out as black specks in the juice, they are very hard to remove and look like dirt) for about one minute. Tip the contents into a muslin cloth and squeeze out the juice leaving the seeds behind. Liquidize the juice only, at high speed, this reduces the particle size and so helps to reduce settling in the final product.
Remove stalks and tops from the pineapple fruits, cut off the outer cortex and pick out the ‘eyes’. Cut the fruit into pieces, discarding any fruit which is bad.
Make the pieces into fruit pulp by liquidizing or passing through a Kenwood colander/sieve (large aperture). The juice can be separated from the pulp by squeezing it through a muslin cloth. Dissolve the sugar in the water and filter through a muslin cloth (sugar often contains dirt and foreign bodies). Heat the sugar and water to 95°C and then add the rest of the ingredients to the hot mixture (heating the sugar and water first, means that the fruit juice is heated up to temperature very quickly up to temperature and so reduces the loss of the sensitive flavor). Heat all the ingredients until the temperature reaches 90°C, hold at that temperature for one minute, then start the filling operation. It is important that the temperature is maintained as close to 90°C as possible.
The fruit juice should be filled into bottles which have been cleaned and then steamed to sterilize them, and are still hot so that the bottles do not crack. The bottles should be filled as quickly as possible so that the juice is not heated for longer than necessary, or recontaminated because it has cooled down before being sealed in the bottle. The lip of the bottle should be clean and dry (wipe with clean tissue paper) before placing the cap on it. Lay the bottles on their side for 15 minutes to cool. Cooling on their side is a most important step to avoid contamination while the cap fits firmly down onto the glass as the vacuum forms.
Equipment list
Bottles, crown corks and labels
Crown corking machine
Cooking facilities, gas ring, electric ring, etc
Stainless steel saucepan
Thermometer in protective jacket
Stainless steel cutting knife and spoon
Wooden spoon for stirring
Steam generator (optional)
Cutting board
Scales
Measuring cylinder
Funnel
Liquidizer
Muslin cloth
This article is licensed under the GNU Free Documentation License. It uses material from the Practical Action’s Technical Brief Mixed Fruit Juice. [“Mixed Fruit Juice“]
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