This section is from the book "Canning, Preserving And Pickling", by Marion Harris Neil. Also available from Amazon: Canning, Preserving And Pickling.
1 quart currants. 1 1/2 lbs. (3 cups) sugar.
Stem the currants and crush each berry with a silver fork; then to two cupfuls of crushed currants add three cupfuls of sugar and stir with a wooden spoon until well mixed. Allow to stand for twenty-four hours, stirring frequently, then fill into sterilized glasses and cover.
The preserve will ferment if each berry is not crushed.
Another Method: Press fresh fruit through a fruit press or a colander fine enough to take out all the skins and seeds. Add an equal quantity of sugar and stir for thirty minutes with a wooden spoon. Be sure that the sugar is well dissolved, as that is the secret of success. Then pour the mixture into sterilized glasses and set away in a cool, dry place until a thin, sugary crust is formed over the top.
Then cover and keep in a cool place.
 
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