Wash the yam well. Put some water to boil it. Boil it with skin .Do not cook very soft. After boiling drain the water allow it to cool. After 5 minutes remove the skin. again allow it to cool for 4 minutes. Cut the yam into round shape pieces.Then add turmeric powder, chilli powder , salt & hing. Mix it gently. Heat the oil . when the oil is hot put the yam pieces one by one. For one time u can put around 10 pieces. Fry it till it turns into brown colour. Remove it from the fire. Allow it to cool and serve.It will be crispy & tasty. Kids will love it.