Aviyal - Mixed Vegetables in Yogurt gravy

Ingredients:

Vegetables: 250 gms of mixed vegetables(bringal,pumpkin,taro,potato,beans,yam,raw banana,chow chow,snake gourd)
Turmeric powder: 1tsp.
Grated fresh coconut :1 cups
Green chillies: 5 to 8 nos. according to taste
Curds 3-4 tbsp lightly sour (if using raw mango, do not use curds)
Salt to taste
Curry leaves : a few
Coconut oil 2 tbsp. (it is the coconut oil which gives aviyal the aroma and taste, hence do not substitute)

Method:

Wash and cut all the vegetables(do not chop finely). Boil the vegetables until just done, with turmeric powder and salt. One should be careful not to overcook the vegetables: they should remain crisp.Grind the coconut with green chillies, without using water. Drain the vegetables. Put them in a wide mouthed large pan in mild heat, add the coconut mixture, beaten curds, curry leaves and coconut oil and gently toss for few minutes, until all the vegetables are coated with coconut and coconut oil. If using a spoon, be careful not to mash the vegetables. Remove from heat add fresh curry leaves