Apple Blackberry Crumble

1 lb. sweet apples
juice of 1 lemon
1 C. fresh blackberries
1/4 C. whole wheat flour
1/4 C. rolled oats
3 T. soft butter
1/4 C. pitted dates, chopped fine
1/4 C. chopped nuts, optional

Preheat oven to 400. Spray or butter an ovenproof dish. Core and slice apples and mix them in lemon juice. Place in a medium size saucepan with blackberries; bring to a simmer. Pour into baking dish. In a separate bowl, mix the flour and oats with the butter until it resembles crumbs. You may need more butter. Add nuts and fruit to pan, cover with crumble mixture. Bake for 25 minutes.