Beef Bourguignon Pot Pie Recipe

Name: Beef Bourguignon Pot Pie Recipe
Ingredients: 7 ounces bacon lardons; 4 tablespoons cooking oil, divided; 2 pounds stewing beef, diced; 1 onion, diced; 2 cloves garlic, crushed; 4 medium carrots, sliced; 1 tablespoon cornstarch; 1 bottle dry red wine; 1 tablespoon tomato puree; 1 beef stock cube; 2 dried bay leaves; 8 sprigs fresh thyme; salt, to taste; pepper, to taste; 8 ounces pearl onions or shallots; 10 ounces button mushrooms; 1 (12-ounce) package ready-rolled puff pastry; 2 tablespoons whole milk