1. Wear disposable gloves, wash yam and scrape the skin. Slice, put in cold water, add a little vinegar to the water to prevent blackening. After 3 minutes, the water will drop.

2. Prepare a plate, cut the onion into small pieces, put the yam into the plate, add a spoonful of salt, sprinkle with chopped green onion, add a little oil, and add two spoonfuls of soy sauce.

3. Finally, put half a spoonful of water in the pot, then put it into the bracket, then put the yam on the bracket, cover the pot, and keep it for 10~ 15 minutes, depending on the individual crispness, 10 minutes is more brittle, and 15 minutes is not so brittle, according to personal taste.

This dish has the functions of tonifying lung, strengthening spleen and stopping diarrhea.