In a clay pot add 2 tsp sesame oil. Add 1 tsp onion vadagam, Add chopped 1 onion, Add chopped 5-6 garlic cloves, Few curry leaves, Saute everything well.
Add chopped 2 tomatoes, Saute till tomatoes become soft and mushy. Add required salt and give a quick mix.
Add 1/4 kg lengthwise cut lady's finger give a mix, Add 1 tsp coriander powder and 1 tsp chilly powder. Add enough water for the kulambu. Cover and cook.
Soak a small lemon sized tamarind in water and extract the juice and keep aside. Open and check whether the lady's finger is cooked well. Now add the tamarind juice and allow to boil well or till oil seperates.
Switch off and allow to set it gets thicker as we added tamarind. Serve hot with rice with appalam or vathal.