For preparing traditional moru curry, first grind the ingredients: grated coconut, turmeric, shallots, garlic and cumin seeds to a fine paste. Keep this aside.
Blend the sour curd in a blender and add the ground coconut paste. Mix gently and add 1/4 cup of water.
Add required salt and add the cooked cucumber pieces. Keep stirring in very low heat until steam appears on ladle. Do not allow to boil and remove the moru curry from fire.