Rinse and pat the okra dry, then cut into 1″ pieces.
Heat 3 tbsp of oil in a skillet over medium heat. Add the okra and sauté for 5 minutes, stirring occasionally, until just beginning to brown. Remove and set aside.
In the same pan, warm the remaining 2 tbsp oil. Add cumin seeds and ajwain, frying for 30 seconds until aromatic.
Stir in the chopped onion and cook until translucent. Add garlic and ginger pastes and continue sautéing.
Pour in the tomato purée, then mix in chilli powder, garam masala, coriander powder, kasuri methi and dried chillies. Cook on medium heat until the oil begins to separate from the masala.
Return the sautéed okra to the pan, stirring to coat each piece in the spiced onion-tomato mixture. Cover, reduce the heat to low, and cook for 10 minutes..
If the gravy becomes too thick or starts sticking, stir in 2-3 tbsp water to loosen. Finish by scattering the sliced ginger on top and sprinkling with extra amchur to taste.