Avial is a traditional Kerala cuisine prepared with a mixture of vegetables in coconut gravy and curd. There are many variations of avial : dry, semi-dry and gravy. I'm listing down the dry recipe of avial.
Cook ash gourd, carrot, snake gourd and beans together with very little water in a vessel. Add salt during cooking. When these vegetables are half cooked, add raw banana to it and cook till all the vegetables are tender. Make sure the vegetables are not overcooked.
Cook yam separately in a pressure cooker till three whistles are sounded. Do not add salt while cooking yam since it takes longer to cook if you do so.
When yam is cooked, add salt to it and allow it to cook for 5 more minutes in a vessel. Mix yam with the other cooked vegetables. Note: Drain away excess water, if any. Do not throw it away, you can use it for cooking anything else.
Grind together grated coconut, green chillies and cumin seeds in a mixer grinder. The mixture should be coarse.
Add the mixture to the cooked vegetables and mix well and heat for 2-3 minutes.