take 5 tsp of urad dal in a mixing bowl. if you do not have urad dal; powder then powder the urad dal in the blender to fine powder (do not roast the urad dal; powder them raw. you can also roast urad dal and powder them; i personally like the raw urda dal flour).
add sour curd to urad dal flour and give a good mix. make sure there are no lumps formed.
also add in salt, chopped ginger and chilli. mix well.
heat the pan, add coconut oil, mustard seeds, urad dal, hing, curry leaves.
when the mustard seeds splutter, pour the tempering over the curd-urad dal mixture
mix well and serve it along with hot steamed rice topping it with coconut oil and sandige menasu.