For preparing Chena Theeyal, first heat oil in a non-stick pan or kadai.
Add shallots, green chillies and chena(yam) pieces.
Add salt and cook on a low flame, till the shallots and yam pieces are cooked well in oil.
Add some water and turmeric and keep on medium-low flame until the yam cooks well.
Heat up another pan or kadai.
Dry roast coconut, till it turns brown.
Add chilly powder, coriander powder, black pepper powder and fenugreek seeds and roast for a few more seconds.
Grind the above into a fine paste.
Add the ground paste into the cooked shallots-yam-green chilly mixture and mix well.
Cook on a low flame.
Add tamarind juice and cook for a few more mins.
Heat oil in another pan or a kadai.
Splutter mustard seeds.
Add red chillies and curry leaves.
Pour the above seasoning into the curry and mix well.
:- Serve Chena Theeyal hot with rice.