Lasagne

Ingredients

• 1 tablespoon olive oil
• 680g minced beef
• 1 onion, diced
• 8 mushrooms, diced
• 2 peppers, diced
• 2 cloves garlic, diced
• 1 tin of tomatoes
• salt
• pepper
• pinch of oregano
• 500ml white sauce
• 150g grated cheese