Lasagne

Serves 4 125g fresh or packet lasagne 500g/1lb lean minced beef or turkey Red Sauce 1 large onion, chopped finely 25g/1oz mushrooms, chopped finely 1 red pepper, chopped finely 2 carrots, chopped finely 2 celery sticks, chopped finely 425g/14oz tinned chopped tomatoes...