Assemble all the required ingredients and vessels. Pre-prep is paramount.
Grease the backside of a big thali/tray/countertop. If using thali/tray and you have more batter you can grease the inside side too. (Ensure you grease very lightly or no greasing once you are confident.)
In a bowl mix together the mentioned besan, sour yogurt, asafoetida, turmeric, salt, sugar, ginger-chilli paste.
Add the mentioned amount of water to make a runny batter.
Pass the batter through a sieve directly into the kadhai to be used for cooking. Ensure that you press against the sieve using a spoon/spatula to extract maximum flavour out of the ginger-chilli fibers. (The batter would be pale yellow)
Place the kadhai on the stove at a medium low flame. Stirring gently and continuously. If using a nonstick kadhai ensure you use only nonstick friendly spatulas-wood, silicon, nylon preferably.
Once the batter starts thickening, consistency like custard, the batter behind spatula leaves light grooves while stirring, immediately lower the flame to its lowest setting and do not leave the batter for even a second and continuously stir. (It would still be matte but slightly deepened in color)My timeline -2 minutes into the cooking process The mixture will continue thickening, the spatula leaving trail through which kadhai is visible that stay 1-2 seconds. Do the peel test-smear a spoonful of batter on a small ungreased plate wait for 45 seconds and try to peel. If it smudges, sticks, peels unevenly it needs more cooking. and it will.
While the batter is cooling keep on continuously stirring the batter in the kadhai My time line- 7 minutes into the cooking process When the batter is ready it will show certain signs 1. It will start collecting in the center in one mass when you move the spatula round the kadhai. But not stiff like dough but more like a paste.2. It will leave a clean cleaved batter that merges after 3-4 seconds. if it doesn't merge it has become overcooked doughy and wouldn't form rolls.3. The batter would look glossy. Its edges would be lightly translucent. 4. Bubbles would try to spurt out. 5. A very fine film of the cooked batter would be visible underneath your cooked batter (like choux pastry)- The starch has gelatinized.6. When lifting spatula the batter would completely cling and on light flicking fall in a heavy plop leaving a v shape of the batter hanging behind on the spatula. 7. Peel test would be successful. (Most important). The peel test signifies sure doneness. you must immediately move forward. Do the final peel test immediately when you see above signs.My timeline - 12 minutes into the cooking process. If scaling the recipe and using thalis keep the batter covered. While using underside of thali use it first than use the backside.
Immediately divide the batter in two. Pour one portion on one plate-a little offset from center. Keep the rest covered. Quickly spread the mixture on the greased plate into a thin sheet.
Repeat quickly with the remaining batter and thali.
Let the batter cool for 5 minutes. Score into 1 inch wide strips using a knife and roll.
If you wish you may sprinkle grated fresh coconut, chopped green coriander before rolling to make stuffed khandvi. You may also apply a horizontal cut cutting the strips in half in order to make khandvi with less layers.
Arrange all this pieces on a serving platter.