Macaroni au Gratin with Meat and Cheese | RICARDO

Ingredients

• 3/4 lb (340 g) macaroni
• 1 lb (450 g) lean ground beef
• 3 tbsp (45 ml) vegetable oil
• 1 onion, chopped
• 2 garlic cloves, chopped
• 3 tbsp (45 ml) tomato paste
• 1 tsp thyme leaves
• 1/4 tsp red pepper flakes
• 1 can (19 oz/540 ml) diced tomatoes
• 1/2 cup (125 ml) beef broth
• 3 tbsp butter
• 3 tbsp unbleached all-purpose flour
• 2 cups (500 ml) milk
• 2 cups (200 g) sharp cheddar cheese, grated
• 2 cups (200 g) mozzarella cheese, grated
• 1 tbsp (15 ml) Dijon mustard