Bangers and Mash Pie | Cooking Professionally

Ingredients

• 1 tablespoon olive oil
• 9 beef sausages
• 1 onion, finely sliced
• 2 cloves garlic, crushed
• 1 large stalk celery, chopped
• 1 tablespoon fresh thyme leaves
• 1/2 cup tomato sauce
• 1/4 cup Worcestershire sauce
• 1 cup beef stock
• 3 teaspoons cornstarch, combined with 1/4 cup water
• 3/4 cup frozen peas
• 3 1/4 cups sweet potatoes, peeled and chopped
• 4 1/4 tablespoons butter
• 1/3 cup milk, warmed
• 1 1/4 cups cheddar cheese, grated