2. Soak beef tendon with ginger and onion, add white vinegar and soak it in water for more than 2 hours, then pour out the water and rinse it off.
3. Peel carrots and shred them; Wash tomatoes and cut into pieces; Dried onions are undressed; Soak pericarpium Citri Tangerinae, and scraping; Wash the red pepper and cut it into fine particles.
4. Heat 1 tbsp oil, stir-fry dried onion, ginger slices, onion and beef tendon, then add carrot, dried tangerine peel, red pepper, tomato and seasoning, cook for 10 minute on medium fire, then simmer for 20 minutes, turn off the fire for _ 10 minute, and repeat for 3 to 4 times; If the amount of water is insufficient, it can be supplemented by injecting boiling water.