Ingredients: oil for frying 450g/1lb lean minced beef 1 onion, finely chopped 1 red pepper, deseeded and finely chopped 1 green pepper, deseeded and finely chopped 150g/5oz button mushrooms, sliced 3 tsp tomato purée 2 bay leaves 2 x 400g/14oz cans chopped tomatoes 1 tsp dried thyme 1 tsp dried parsley 1 tsp dried oregano butter, for greasing 300g/10½oz 'no pre-cook' lasagne sheets ...