Take the sliced bitter gourd in a bowl.
Add water and salt.
Keep aside for at least an hour. The more you keep, the better.
Drain the water and squeeze the bitter gourd.
Add chilli powder and turmeric powder and mix well.
Dilute the tamarind paste in 2 tablespoon water. Keep aside.
Heat oil for deep frying.
When the oil is hot, fry the bitter gourd, in batches till they are crispy.
Drain onto an absorbent paper. Keep aside.
Heat 1 tablespoon oil in a pan.
Add the chopped onion and saute till light brown in colour.
Add the ginger-garlic pastes.
Saute till the raw smell goes.
Add the chilli powder and turmeric powder and stir for a few seconds.
Add the chopped tomatoes and cook till oil separates.
Tip in the fried bitter gourd and mix well.
Add the tamarind paste, diluted with water, and cook for a minute.
Adjust the seasoning. You may add sugar if you wish.
Switch off heat and serve hot.
Goes well with Rice as well as Roti.