Family shepherd's pie

Ingredients

• Topping
• 4 medium, cooked, mashed potatoes
• 2 cooked, mashed parsnips
• 2 tablespoon olive oil
• 1 chopped onion
• 1 clove, crushed garlic
• 500 gram beef mince
• 450 gram jar tomato passata
• 125 gram sliced mushrooms
• 1 stalk, chopped celery
• 1 chopped carrot
• 1 chopped zucchini
• 2 cup beef stock or water
• 1 tablespoon worcestershire sauce
• 1 cup tasty cheese, grated
• crusty bread, to serve