Diner sloppy joes - Good Food Middle East

Ingredients

• 1 tbsp vegetable oil
• 1 onion, finely chopped
• 2 small red peppers or yellow peppers, finely chopped
• 2 garlic cloves, crushed
• 400g minced beef
• 2 x 400ml cans chopped tomatoes
• 2 tbsp chipotle or smoky barbecue sauce
• 4 cheese slices
• 6 burger buns
• crispy onions, to serve
• iceberg lettuce, to serve