Grape-Plum Jelly

Yield: 10 Half-pints
Categories: Jams & Jellies, Canning, Preserves
3 1/2lbRipe plums
3lbRipe Concord grapes
1cWater
1/2tsButter or margarine (opt.) to reduce foaming
8 1/2cSugar
1 3/4ozPowdered pectin
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