All Day Venison Pot Roast

INGREDIENTS

• 3 onions, chopped
• 5 carrots, cut into 2-inch pieces
• 1 cup chopped portobello mushrooms
• 3 pounds venison rump roast
• 2 garlic cloves, crushed
• 1 tablespoon ground black pepper
• salt to taste (optional)
• 1 (10.75 ounce) can condensed cream of mushroom soup
• 1 (10.5 ounce) can condensed beef broth
• 1/4 cup water
• 1 (1.25 ounce) envelope dry onion gravy mix