Blackberries are packed with a and k vitamins, lots of fiber, and antioxidants. If in season, these berries are plump and very sweet, but otherwise might be tangier. If the latter is the case where you live, use them for a simple and sweet crumble dessert. Fruit desserts are great options after heavy and fatty dinners. Use a 50-50 mix of blackberries and raspberries for a tangier flavor, or add diced granny smith apples for a firmer texture.