NOTE: Unsweetened frozen boysenberries may be used if fresh berries are unavailable. Mix frozen fruit in with the sugar and flour, etc. Do not use sweetened frozen fruit, as that would mess up the recipe (and be WAY TOO SWEET and the syrup consistency would change!)
Deep Dish Boysenberry Pie https://www.thegratefulgirlcooks.com/deep-dish-boysenberry-pie/