Start by chopping all the veggies. Cook onions, carrots, celery, and red bell pepper in a frying pan in the olive oil over high heat. Add all the seasonings and cook the veggies for about 5 minutes.
In a crock pot empty the two cans of diced tomatoes, the red lentils, vegetable stock, and the sauted vegetables. Cook for 4 hrs on high or 6-8 hrs on low. Turn heat off, stir, and let sit for half an hour, then serve and enjoy!