To clean and chop yam - Before you start working -
apply oil on your knife and hands and then scrub the yam under running water and then make big slices or strips of 1 inches thickness.. Don't forget to grease your hands otherwise they may get itchy due to the yam's skin.
Then peel the yam skin carefully with a strong and sharp knife and chop into small cubes.(after peeling 1 kg whole Suran you will get around 750 gm suran pieces )
Wash the chopped suran pieces with enough water and then pressure cook with 2.5 glasses of water and 1/4 tsp turmeric . You may need to cook for 3-4 whistles depending on the quality of suran, But don't over cook it else it will get mashed up while stir frying.
You can also boil it in a pan then add some extra water and cook till done .
Drain the boiled suran on a colander to remove the extra water.
Mix all the spices and salt in a small bowl and keep aside.
Heat oil in a heavy bottom wide pan or use a nonstick pan.
Now add the cumin and carom seeds in the oil,when they start to crackle add asafoetida and cloves and give it a stir.
Add the mixed spices in the pan and then immediately add the beaten yogurt and mix.
Keep stirring the yogurt until it start boiling.
Now add the boiled suran pieces in the yogurt and mix gently.
Cover the pan with a lid and simmer for 3-4 minutes ,mix twice in between.
Now add the chopped coriander and mix gently.
Serve with paratha,poori ,roti or as a side dish with your meal,taste great with almost every thing.