Mum's Cottage Pie

Details

Ingredients

• 2 large potatoes, peeled and diced
• 2 tablespoons milk
• 1 tablespoon butter
• salt and ground black pepper to taste
• 1 tablespoon vegetable oil, or as needed
• 1 large onion, diced
• ½ pound lean ground beef
• ⅓ cup dry sherry
• 1 dash Worcestershire sauce
• 1 ½ teaspoons all-purpose flour
• ½ cup grated Parmesan cheese
• ⅓ cup grated Parmesan cheese