Marinate chicken with curd, black pepper, salt and oil for half an hour.
Take a kadhai add some oil. Put some black pepper and fry the onion.
After frying onions add chicken.
Nicely cook the chicken till all the water evaporates. Your can add water if needed but you have to cook well so that the water of curd and chicken evaporates nicely.
Delicious dahi chicken is ready.
Enjoy with roti or naan.