Sauté the bhindi: Heat 2 tablespoon mustard oil in a wide pan on medium high, add bhindi with salt and turmeric, cook 5 minutes until 75% done, set aside.
Make the tadka: Add remaining oil, crackle cumin seeds and green chilies, sauté onions until light brown.
Add aromatics: Stir in ginger garlic paste, cook 30 to 40 seconds until fragrant.
Add yogurt mixture: Whisk yogurt with all spice powders, add to pan on low heat, stir well.
Add tomatoes: Add diced tomatoes, cook 2 minutes until softened.
Combine and finish: Gently fold in sautéed bhindi, cook 5 to 8 minutes until fully done.
Garnish and serve: Crush kasuri methi over the curry, garnish with cilantro, serve hot with paratha or roti.