- Pre-heat oven to 200°C/400°F/Gas Mark 6. Heat the oil and sauté the onion until soft. Add the minced lamb and fry until brown.
- Add the tomatoes, Worcestershire Sauce, tomato puree and mixed herbs. Season with salt and pepper.
- Simmer for 15 minutes then transfer the meat mixture to an ovenproof dish.
- Place the pastry mix into a mixing bowl. Rub in the butter then stir in the grated cheese.
- Spinkle the crumble topping over the meat mixture and bake for 30 minutes until evenly browned.