Summer berries team up with sliced apples for a delicious fruit and berry crisp. This would make a very good red, white, and blue dessert for a fourth of july cookout or any summer event. The classic butter, brown sugar, and oat crumble topping gives it a wonderful crunchy texture, and the dessert isn't overly sweet. Add some chopped pecans to the topping if you like. Sliced strawberries can be substituted for the raspberries. Alternatively, use peaches or pears instead of apples.