Baked Tomato Mushroom Soup

INGREDIENTS

• 1/4 lb unsalted butter
• 5 lbs onions, chopped
• 1/4 cup minced garlic
• 1 lb mushroom, sliced
• 32 fluid ounces low sodium beef broth
• 32 fluid ounces water
• 5 lbs Tomatoes, chopped
• 1/4 cup thyme leaves, chopped
• salt
• pepper, to taste