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I have a couple of friends that would like jelly but in a small amount, I started doing this years ago. Whenever I make jelly or jam, I always put approximately 3/4 cup in one of those coffee mugs I would really like to get rid of.
I first put 3 Tbsp. of grated paraffin wax in the bottom; pour hot jam into the mug. The paraffin wax will rise to the surface to seal the cup. While it is still fairly translucent, I tuck a piece of cotton string about 3 inches long into the hot wax, leaving half of it sticking out. To use the jam, all they have to do is pull on a string with little effort. The paraffin wax will come off, there's no need to poke, stab or jab to get the paraffin off.