Beef Bourguignon Soup

Name: Beef Bourguignon Soup
Ingredients: 3-4 thick cut slices applewood smoked bacon approximately 4 ounces; 2 tablespoons flour; 1 ½ teaspoons salt; ½ teaspoon freshly ground black pepper; 2 pounds stew beef meat cut in 1/2-inch dice; 1 medium onion chopped in 1/4-inch dice; 3 medium cloves garlic minced; 6 tablespoons tomato paste; 2 cups good quality dry red wine a little more than ½ of a 750ml bottle; 6 cups beef stock; 4 medium fresh thyme sprigs; 1 large bay leaf; 4 tablespoons pesto prepared or homemade; 2 teaspoons brown sugar; 2 stalks celery diced into ½-inch pieces; 8 medium carrots peeled and diced into ½-inch pieces; 2 medium potatoes peeled and diced into ½-inch pieces; 2 tablespoons butter; 8 ounces cremini or button mushrooms sliced; 1/2 teaspoon kosher salt