Wash the okra/bhindi. Drain and dry with kitchen towel. Once dry, slice into rounds and set aside.
Heat oil and add sliced onions. Cook till light brown, and then add cumin seeds followed by whole red chilies. Saute for about 30 seconds and then add salt and turmeric.
Stir and cook till the spices release their flavours and then add the sliced okra/bhindi.
Cook on medium heat for about 3-4 minutes, and then turn heat to low. Cover and cook till okra/bhindi is tender (about 20 minutes).
Once the okra/bhindi is cooked through, add lemon juice and green chilies.
Serve hot with chapatti.
Notes
Bhindi / Okra should not be washed after it is cut, else it will get slimy.