Peel the skin of the vazhakkai and cut the raw banana into big cubes.
Slice the onions and tomatoes into thin long slices. In a pan add oil and add in the mustard seeds and curry leaves.
Add the onions and cook in a medium flame till it turns translucent.
Add the tomatoes and cook till it becomes mushy. Add the sambar powder, turmeric powder and salt.
Add in the cut vazhakkai and sprinkle little water to this and mix well. Cook this till the vazhakkai becomes soft.
Stir this often and sprinkle little water if needed.
Grind the shallots and coconut coarsely. You can add very little water if you want.
Add this to the cooked vazhakkai mixture and mix evenly and carefully.
Cook for 2 minutes in a medium flame and switch off the flame.
Chettinad style vazhakkai curry is ready.
You can add fennel seeds | sombu while adding mustard seeds or it can be added while grinding with coconut. You can replace vazhakkai with dried peas and fresh mochai or green peas. Sambar powder can be replaced with red chili powder. You can lessen little sambar powder and add few pepper corns while grinding.