In a strainer add 2 tbsp of yellow and 2 tbsp black mustard seeds (50:50), wash under running water, and grind with one green chilli to a smooth paste by using your food processor. From this mustard paste use 1 tbsp for making Chanar Paturi. You can use rest of the paste for making mustard based fish or vegetable curries.

Or else, you can use ready to use mustard powder (Sunrise brand). If cooking with the mustard seeds powder, use 1 tbsp of it and follow the package instructions for dissolving.

In a food processor add grated coconut and green chillies. Add 2 tbsp of water to it and make a coarse paste, keep aside.

In a bowl mash the panner/chana until lump-free. Add in the coconut-chilli paste, mustard paste, salt, turmeric powder, coriander leaves, and mustard oil. Mix well. 

Heat the banana leaf sheets from one edge to another (glossy side down) over low flame for a few seconds. This is for easy folding, care should be taken not to burn out the leaves.

Cut the banana leaves into rectangles. Keeping in mind that you need the leaf pieces to be spacious enough to wrap, and parcel the portion of panner/chana mixture. Clean the leaf pieces with a wet kitchen towel. Grease the upper part of the leaf sheets with mustard oil.

Now place 3 ½ tbsp of panner/chana mixture carefully over the oil-coated side of a banana leaf sheet. Gently shape the mixture into a rectangle by using your fingers. Place 1 whole green chilli on top (depending on personal preference you can slit the chilli as well). Wrap and make a parcel. Tie with cotton thread.

Continue the same process for the rest of the panner/chana mixture.

For a step-by-step Paturi making method check this post.

Grease a regular iron tawa (not nonstick) generously with mustard oil. Place the parcels/paturi on tawa. Cook for 20 minutes over low heat. Flip the parcels after every 3-4 minutes. Let the parcels turn brownish in colour. Your delectable Chanar Paturi is ready to devour. Give the Paturi 5 minutes of standing time before uncover.

To enjoy Chanar Paturi, start by cutting the threads of the banana leaf parcel and serving it hot with steamed rice. Unwrap the parcel first, take out a portion of Paturi, mix and mash it with rice, enjoy!