Drain the red beans in a colander and dry with a paper towel. Wash and peel the carrots. Peel the onion. Wash the Chinese cabbage and mushrooms and dry with a paper towel. Remove the top layer of skin from the mushroom cap, remove any discoloration, and recut the stem of the mushroom.
Cut mushrooms, carrots, onions and lettuce into small cubes.
Heat a frying pan with vegetable oil. Fry the carrots and onions for 5 minutes, then add the mushrooms. Fry everything together for 10 minutes.
Add red beans, Chinese cabbage and tomato paste to the pan. Stir. Cook a little longer until the cabbage is soft.
Place the prepared filling on the tortilla and wrap it up. The burrito is ready.