Heat oil in a pan. Add mustard seeds. When it starts to pop add urad dhal & red chilies and fry for few minutes. Add the chopped onions and fry until the onions become translucent. Then add the grated carrots and salt and mix well. Add little water. Cover the pan. Lower the heat and cook until the carrot is cooked. Add the grated coconut. Stir once and remove from heat.