I don't have a specific recipe for mine. I just peel/core/slice enough apples AND pears to cover the bottom of a pyrex dish to a depth of about 2 inches. Mix the apple and pear slices with brown sugar, cinnamon, and about 2 teaspoons of lemon juice. Place in the dish and sprinkle 3-4 tsp water over the fruit and bake for 20 mins at 200C.
Meanwhile, mix rolled oats (a cup or two, depending on the size of your dish), a couple of teaspoons plain flour, a teaspoon or so of cinnamon, and a few tablespoons of brown sugar together, then rub in a few ounces of unsalted butter. Spread this over the baked fruit and bake for another 20 mins or so at 200C.