From Barbara Kingsolver's Animal Vegetable, Miracle.

Ingredients: 
2-3 apples, chopped
2 pints blackberries
2 tbsp balsamic vinegar
1 large handful of basil leaves, chopped
¼ cup honey – or more, depending on tartness of your berries
 
5 tbsp flour
3 heaping tbsp brown sugar
1 stick cold butter
 
Preparation: 

Preheat oven to 400. Combine apples, blackberries, vinegar, basil and honey in an oven-proof casserole dish, mix and set aside.

Cut butter into flour and sugar, then rub with your fingers to until the butter is in pea sized pieces and very crumbly.  Sprinkle it over the top of the fruit and bake 30 minutes until golden and bubbly.