Homemade Grape Jelly Grape Jelly 3 - 1.75 box sure Jell Premium Fruit Pectin 5 1/2 cups Concord grape juice( I use Welches) 3 1/2 cups sugar Combine the pectin with 1/4 cup of sugar in a small bowl. Place the remaining sugar in a separate bowl and set it aside. Pour the grape juice into a large pot and stir in the pectin-sugar mixture. Bring the mixture to a rolling boil, then add the remaining sugar. Return to a rolling boil and let it cook for 4 minutes. Remove the pot from the heat and skim o