In heavy bottomed 8 quart pot add oil and heat to medium high, add onions and bell pepper, cook for 5-10 minutes until soft and slightly browned. Reduce heat to medium, add the garlic, stir in, and cook until fragrant, 2-3 minutes. Add the tomato paste and seasonings, and stir to coat the vegetables in the paste. Stir continuously to prevent sticking, if needed use some broth to help, allow to cook for 10 minutes. Then, add remaining ingredients, bring the soup to a simmer and allow to cook for at least 20 minutes.