Beef Bourguignonne

Name: Beef Bourguignonne
Ingredients: 6 strips thick-cut bacon, chopped; 2 1/2 pounds flat-iron or tri-tip beef, cut into 1 1/2-inch cubes; Kosher salt and freshly ground pepper; 2 medium carrots, diced; 2 medium onions, diced; 1 sprig fresh thyme; 1 bay leaf; 2 cloves garlic; 1 sprig fresh parsley, plus more for garnish; 1 4-inch piece celery stalk; 3 tablespoons all-purpose flour; 1 tablespoon tomato paste; 1/2 cup brandy; 2 cups burgundy, cotes du rhone or other dry red wine; 2 cups beef stock; 2 tablespoons unsalted butter; 3/4 cup pearl onions, peeled; 1 teaspoon sugar; 1 cup quartered button mushrooms