Relleno Tomato Broth

combine tomatoes, onions, and garlic in a food processor process to a smooth puree heat oil in a saucepot, over a medium-low flame add the puree, heat and stir until thickened, without burning place over a moderate flame stir in chicken or pork stock and add sachet bring to a boil, reduce heat, and simmer until slightly thickened remove and discard sachet serve hot