Blackberry Freezer Jam Prep: 40 min Cook: 5 min Serves: 64 Save Share Ingredients (5) 3¼ cups mashed blackberries 2 tablespoons freshly squeezed lemon juice One 1.75-ounce box Sure Gel pectin 1 cup light corn syrup 4 cups granulated white sugar Directions Learn how to make this recipe at Go to Recipe Sharing options Close Share on Pinterest Share on Facebook Share on Twitter