Meaty Spaghetti Sauce

1 pound lean ground beef

1 pound pork sausage

2 ounces sliced pepperoni sausage

1 green bell pepper

chopped

½ red bell pepper

chopped

1 tablespoon minced garlic

2 onions

chopped

2 carrots

diced

2 stalks celery

chopped

1 (8 ounce) can sliced mushrooms

1 (15 ounce) can tomato sauce

2 (14.5 ounce) cans diced tomatoes

2 (6 ounce) cans tomato paste

3 cubes beef bouillon cube

3 bay leaves

1 tablespoon dried thyme

1 ½ tablespoons dried oregano

1 ½ teaspoons dried basil

½ teaspoon crushed red pepper flakes

1 teaspoon ground black pepper

1 tablespoon white sugar

1 cup beef broth