Beef Bourguignon

Name: Beef Bourguignon
Ingredients: – 8 ounces thick-cut bacon, diced; – 2 ½ to 3 pounds beef chuck roast, round roast, or other similar cut, cut into 1-inch cubes; – 1 ½ teaspoons kosher salt, or more to taste; – ½ teaspoon pepper, or more to taste; – 2 tablespoons flour; – 2 cups red wine, divided; – 2 medium yellow onions, thinly sliced; – 3 medium carrots, sliced; – 3 whole stalks celery, sliced; – 3 cloves garlic, minced; – 2 tablespoons tomato paste; – 3 to 4 sprigs fresh thyme; – 1 bay leaf; – 1 cup chicken or beef broth, plus more if necessary; – 1 pound mushrooms, sliced; – 1 tablespoon butter