1/4 cup canola oil
1 lb okra, rinsed and dried (important!), tops cut off but not cut into pods
1 tsp cumin
1 red onion, thinly sliced
1 tbsp coriander
1 1/2 tsp salt
1/2 tsp cayenne
1/4 tsp turmeric
1/2 tsp tamarind paste/concentrate, whisked into 1/2 cup water in a small bowl to dissolve the paste
2 tbsp cilantro

Fry the okra in oil, about 5 minutes, in batches. Heat cumin seeds, then onion, stir fry until light brown. Add coriander, salt, cayenne, turmeric, 1-2 minutes. Add tamarind water. Lower to medium, simmer about 5 minutes until liquid is absorbed into the okra and it's fork-tender. Add cilantro.

Source: 660 Curries by Raghavan Iyer