Wash and remove/peel the side string the guvar phalis and Chop to make big pieces of about 1 inches.
Peel and chop potato into big pieces. grind tomato and make a smooth puree
Heat oil in a pressure cooker.
Add cumin and carom seeds,when they start crackling add asafoetida.
Now add chopped tomatoes ,salt and all the add powdered spices and stir fry till oil start leaving the sides.
Add chopped guvar phali and potatoes and stir for a minute and then add water(3/4 - 1 cup approx)
Mix and pressure cook for about 2-3 whistles or cook till done.(cooking time depends on the quality of your guvar phali,if its tender it will cook quickly but hard mature guvar takes little extra time to cook)
Open the cooker when cool down completely.
Add lemon juice ,pinch of sugar and fresh coriander and mix.
Serve hot with roti,paratha or daal rice combo.