Kalan -vazhayka Moru curry

Ingredients
Raw Banana - 1
Yam – 200gms
Thick sour curd – 3 cups
Turmeric powder – 1 tspn
Chilli powder – 1 tspn
Pepper corns – 1tblspn
Salt to taste
Coconut – 1 cup
Cumin seeds - 2tspn
Green chillies – 4nos
Curry leaves – 2 springs
Methi Seeds – 1 tspn
Mustard seeds – 1tspn
Red chillies –3 (broken into two)
Coconut oil – 2 tblspn
Preparation
1.Wash and cut the vegetables into 2" square pieces.
2.Cook the vegetables, in just enough water, adding turmeric powder, chilli powder and salt.
3.Grind together to a very fine paste, coconut, pepper corns ,green chillies and cumin seeds.
4.When vegetables are cooked, add ground ingredients, well beaten curd and more salt. 
5.Simmer, stirring occasionally till the mixture becomes quite thick (10 -15 minutes). Remove from fire. 
6.Heat oil in a pan.
7.Add fenugreek, mustard seeds and broken red chillies.
8.When seeds crackle, add curry leaves and temper the dish.