Brown the hamburger then remove from pan, leaving rendered fat.
Sauté the onion and bell peppers and garlic in the hamburger fat until soft
Add diced tomatoes, tomato sauce, bay leaf, red pepper flakes, and cooked hamburger back to the pot. Simmer for an hour, covered.
Add tomato paste, oregano, and basil, simmer for 2 more hours uncovered, stirring occasionally. Season to taste, then chill overnight.
Reheat in crock pot and serve with hoagie rolls, maybe some potato chips.