Grease 2 baking sheets or steel plates with oil and keep it ready. Alternately can grease your kitchen top.
PREPARATION OF THE BATTER:
Add chickpea flour and yogurt in a saucepan.
Whisk it gently to break up any flour lumps.
Add water and whisk well to mix. Use a hand whisk or an electric one.
Add green chilli, ginger, garlic pastes, asafoetida if using any, turmeric powder and salt.
Mix well.
COOK THE BATTER:
Place the pan over low to medium heat and constantly stir the mixture to avoid any lumps from forming.
You will need to cook the mixture and stir it frequently for 10-15 minutes. Once the mixture becomes hot it takes the batter 10 minutes to thicken and come away from the pan.
Take a small blob of the paste and try and spread it at the corner of one of the tray/plate/worktop using a spoon. If it spreads easily and you can roll it up, the mixture is ready. If not then cook it further for 5 minutes.
SPREADING THE BATTER:
Take half of the mixture and place is along the edge of the tray/Plate or the prepared worktop.
Place the pan on low heat again. If the remaining batter becomes cold it will be difficult to spread it out.
Take a flat spatula and spread out the mixture horizontally or vertically. Be quick.
Make it as thin as possible.
Take the remaining paste and repeat the procedure using the other tray/plate or worktop.
Let the spread out mixture cool.
PREPARATION OF THE TEMPERING:
In the meantime, prepare the tempering.
Heat the oil in a small pan over low heat.
When it gets hot, add mustard seeds. When it begins to splutter, add the curry leaves and asafoetida if using any.
Add chopped green chillis, chopped coriander and grated coconut.
Keep the tempering on the side.
ROLL THE KHANDVI:
Cut the spread out mixture into strips that are about one inch thick.
Roll up each strip like a swiss roll, gently.
Place the rolled up khandvi in a serving plate.
Repeat with the remaining strips.
Pour the tempered mixture over the khandvi and serve.
Notes
The ready batter should come away easily from the sides but not form a lump.
When you spread the first half of the mixture, return the pan onto the low heat. If the paste becomes cold, it will not spread. THIS IS AN IMPORTANT TIP.
If you want to roll smaller khandvis, then cut each strip into half horizontally before rolling.
Grease the trays/plates/worktop sparingly. Too much oil will result in the batter coming back onto the spatula when you try to spread it.
Try half the recipe first. If it does not spread evenly, do not throw the paste away.
Crumble up the cold cooked batter with a fork or a masher. Add tempering, mix and enjoy with some sev.
Batter will be stuck on the sides of the pan. you may trim some of the rolls. Don't throw that away. Like above, crumble it up, add tempering and enjoy.
Place a kitchen towel under the trays or plates so that when you spread out the batter, they do not slip or move.