2. Wash the ribs, chop them into 3cm pieces, put them in a basin, add ginger, onion, salt, monosodium glutamate, white sugar and soy sauce, and marinate them 1 hour.

3. Put the yam at the bottom of the steaming bowl, and then put the ribs in the bowl (except the onion and ginger).

4. Steam the steamer with strong fire, put the steaming bowl in the steamer, cover it, steam for 50 minutes, stop the fire, buckle the steaming bowl with a plate and turn it over.

Eat once a week 1-2 times.