Add the dal, brinjal, water, turmeric powder and fennel seeds to a pan and cook on medium low flame till the dal gets mashed and the brinjal gets cooked.
Meanwhile, grind the coconut to ginger paste to a smooth paste.
Add it to the cooked curry and keep till it simmers, approximately 5 minutes. Adjust your salt.
Heat oil in a little saucepan. Splutter the mustard seeds.
Fry the dry chillies and curry leaves and dump into the curry. Serve with rice and any side dish of your choice.