Grape Jam Yield: 20 oz TOOLS Heavy bottomed potWooden spoon20 ounce jar. 1 pound grapes 8 ounces sugar 1 tablespoon lemon juice. Cut grapes (halves) and blend until completely blended. Put the blended grapes, sugar and lemon juice in a heavy bottom pot. Bring mixture to boil on medium heat boil until thick enough to coat a spoon. Takes 25-35 min. Pour into a jar cool in fridge. Store in an airtight jar in the refrigerator. Last 1-2 wks. Choose any fruit.