This homemade blackberry filling is thick, glossy, and bursting with juicy blackberries. A touch of lemon juice and zest brightens the tart flavors, while a half cup of fresh berries folded in at the end adds extra texture. Perfect for homemade pie, cake layers, cheesecake, or spooned over ice cream, this easy recipe uses simple ingredients and comes together in just a few minutes for a versatile filling you’ll want to make again and again.