There's loads of fruit growing on public land - if you check out the Fruitfall website http://fruitfall.ning.com/, you'll see what I mean. That's just in the Milton Keynes area, but you could start one where you live. Don't all come to Milton Keynes and chomp your way through our fruit though!!!
Apple and Blackberry Crumble from free, fresh fruit tastes delicious.
Half-fill a pie dish with lovely blackberries and chunks of apples (cooking or eating, it didn't really matter to me), dot with butter and sprinkle over some sugar (brown or white - you choose). Top with a crumble mix of 8oz plain flour, 3 oz butter and 3 oz sugar. Cook in the oven until the top is golden brown - yummmmmm.