To make Marinara Sauce:

1. In a sauce pot, stir fry onions, celery, red bell pepper and garlic with olive oil over medium heat until onions are tender.

2.  Add the tomatoes, oregano, cayenne pepper, black pepper and salt; continuously stir for another minute.

3. Transfer the mixture into food processor; pulse until tomatoes are crushed.

4. Bring the sauce back to pot; occasionally stir and let the sauce simmer for few minutes.

To make meatballs and serve with Marinara Sauce:

1. In a medium pan, add oil; stir fry garlic, onions, carrots, green peppers, celery, fennel and salt to your taste over medium-high heat until carrots are tender.

2. Reduce the heat, add tomato paste, vinegar, oreganos, thymes, parsley, crushed peppers, and cayenne peppers, mix until combined.

3. Let the vegetable mixture cool down.

4. Pre-heat the oven to 400 degrees.

5. In a separate bowl, combine the ground beef, eggs, bread crumbs, Parmesan cheese and the vegetable mixture, mix well, to form a ball as shown in the picture.

6. Place them individually in a single layer on baking rack with the pan, bake them until meatballs cooked thoroughly.  It usually takes about 20 to 25 minutes. You may want to turn the meatball once and cook them for 5 minutes longer.

7. Put marinara sauce over meatballs. Enjoy!