In a large pan, heat the olive oil over medium-high heat and sauté the onion and garlic in it until translucent for 4 minutes. Mix often. Add 2 teaspoons of red pepper flakes to the onion and garlic and cook for 1 minute. Reduce the stove heat to medium. Then add the red bell pepper and cook for 3 minutes.
Add the ground beef to the pan and break it up into pieces until browned. Add 1 tsp of salt and 1 tsp of pepper to the meat, along with 1 tsp oregano, 1 tsp basil, ½ tsp rosemary, ½ tsp thyme, and ½ tsp red pepper flakes. Add the tomato paste and mix it into the meat.
Lower the stovetop heat to low-medium. Add the strained and diced tomatoes, 1 tsp oregano, 1 tsp basil, ¼ cup water, 1 tsp salt, and 1 bay leaf. Mix and then let everything cook and simmer for 30 minutes.