Vendakkai Gravy - Ladies Finger gravy for rice and chapatti

Ladies finger (cut into 2inch) - 250gms
Onion - 1no
Tomato - 1no
Chilli powder - 1tsp
Turmeric powder - 1/4tsp
Coriander powder - 1tsp
Garam Masala Powder - 1/4tsp
Gram flour - 1/2tsp
Curd - 2tbs
Water - 1cup