In a large stock pot over medium heat, brown the ground beef, pork and onion. Drain fat, and return to the heat.
Stir in the garlic, green and red pepper, mushrooms, and tomato sauce. Stir in basil, oregano, Italian seasoning, bay leaves, and red pepper flakes. Salt and pepper to taste.
Bring sauce to a boil. Cover and reduce heat to low. Let simmer for at least one hour; preferably all day.
