Pre-soak the beans in cold water for 3-4 hours, rinse, pour cold water, put on fire. After boiling, cook for 30 minutes, then flip into a colander, rinse with cold running water, pour water again, put on fire and cook until “al dente”. Wash the tomatoes, make cross-shaped incisions in the upper part, put them in a bowl and pour boiling water over them.after 15 minutes, drain the hot water and hold it under cold water for a while, clean it.
Peel the onion, carrot, and garlic, wash and dry. Remove the seeds and webbing from the bell pepper.