For preparing Kerala Theeyal, place all the vegetables along with salt, turmeric powder, curry leaves and enough water in a pan and keep it on flame.
Cover and cook the vegetables till done.
Heat up a pan or kadai.
Add fenugreek seeds and stir for a sec.
Add grated coconut and fry till it turns brown.
Add coriander powder and chilly powder and stir well.
When the coconut mixture starts to turn brown, switch off the flame.
Allow it to cool.
Grind it in a mixer grinder along with enough water so as to form a smooth paste.
When the vegetables are done, add the tamarind extract followed by the above coconut paste.
Allow it to boil.
When the desired consistency is reached (which is neither too thick nor too thin), remove from the flame.
Heat oil in a pan or a kadai.
Add cut small onions and fry them well.
Splutter mustard seeds and saute dry red chillies and curry leaves.
Add the above tempering into the Kerala Theeyal curry and mix well.