Kitchen Chemistry : Week 7 : Jams, Jellies, and Preserves

Week #7

Reading pp 296, 605-614 Pectin and Partners for Perfect Preserves

Homework Questions
1. What is the difference between a jam, jelly and preserve?
2. What is the purpose of making jam?
3. Why do we add sugar to the recipe?
4. Where does pectin come from?
5. What is the purpose of the pectin?
6. Why do we have to boil the jars before we put our jam in?
7. If the lid does not seal after the jam has cooled what does that mean?
8. How does the low sugar version of pectin work?

Recipe
Strawberry or other Berry Jam
From Certo package insert

Yield is about 8 cups of jam
Ingredients:
• 4 cups crushed fruit (this is about 2 quarts of fresh fruit or 2.5 pounds of frozen, thawed fruit)
• 7 cup white sugar
• 1 pouch of liquid Certo

Method:
• Start the dishwasher with the jam jars. The best jars are the Mason Jars with the lid, glass jar and screw bands. To achieve the best seal, it is best to put the jam into a hot glass jar, so time the dishwasher accordingly.
• Prepare fruit. For berries, crush the fruit with a potato masher to the desired chunkiness.
•Measure the exact amount of prepared fruit into a 6 or 8 quart saucepan. It is best to use a pot in which the fruit does not go above about one quarter of the depth to prevent the jam from boiling over
• Stir sugar into fruit
• Bring mixture to full rolling boil ( a boil that does not stop bubbling when stirred) on high heat stirring constantly
• Stir in Certo quickly. Return to full rolling boil and boil exactly 1 minute stirring constantly. Remove from heat. Skim off any foam with a spoon.
• Using a 2 cup measuring cup, ladle quickly into prepared jars, filling to within 1/8 inch of tops. Wipe jar rims and threads. Cover with flat lids, then screw bands tightly.
• Invert jars for 5 minutes, then turn upright.
• After jars cool, check seals by pressing middle of lid with finger. If lid springs back, lid is not sealed and refrigeration is necessary.
• Let stand at room temperature 24 hours. Store unopened jams in a cool dark place up to 1 year. Refrigerate opened jams up to 3 weeks.

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