Saute the veggies in oil until tender. Add the tomatoes. Either leave it in the saucepan for 15 minutes or throw it in a casserole dish to bake for like an hour or hour and a half. The longer it can be cooked, the better it gets. At the last moment, add a dessert spoon full of nut-butter but only a little so you don't O.T.T. It gives an incredible flavour. Serve over pasta (or rice).