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How to strain seeds from fruit when making jelly
Find a good recipe for fruit jelly and follow its directions for cooking and softening the fruit.
Wet a large jelly bag or several jelly bags (depending on how much you're making) by soaking them for a few minutes in warm water.
If you do not have a jelly bag, wet several squares of cheesecloth big enough to line a colander or strainer.
Suspend the damp jelly bag over a container large enough to collect all the strained juice. You could also suspend the lined colander or strainer over a container.