Slow Cooker Beef Pot Roast | Food Stuff

Ingredients

• 1 tablespoon butter
• 3 medium carrots, cut into chunks
• 2 stalks celery, cut into chunks
• 2 1/2 cups chicken broth
• 1 tablespoon all-purpose flour, or as needed
• 1 1/2 tablespoons all-purpose flour
• 1 sprig fresh rosemary
• 2 sprigs fresh thyme
• 2 cloves garlic, minced
• 8 ounces sliced mushrooms
• 1 medium onion, chopped
• 1 (5 pound) bone-in beef pot roast
• salt
• pepper
• 1 tablespoon tomato paste
• 2 tablespoons vegetable oil