Clean chicken and make slits. Marinate chicken with a mixture of salt, pepper and ginger-garlic paste. Refrigerate it for ½ an hour.
Coarsely powder coriander seeds. Add powdered red chillies and mix with vinegar. Apply this on chicken pieces and marinate for 1 hour keeping refrigerated.
Heat little oil in a pan. Place the chicken pieces in it and fry both sides. The masala should stick in chicken pieces.
Remove from pan, dip in corn starch and again in flour. Fry the chicken again in low flame till cooked.
In another pan, add 2 tsp of oil(can use the fried oil also), Add 1 tsp ginger-garlic paste and onion slices. When fried, add the corn starch in which chicken is dipped.
Let the masala become thick. Pour this on the fried chicken and serve hot with chappathi / rice.