In a bowl, take the all-purpose flour (maida), cornstarch and salt.
With a wired whisk or a spoon mix the dry ingredients.
Add water.
Whisk well to a get smooth and slightly thin consistency of the batter without any lumps.
The batter should be of a flowing consistency. Depending on the quality of flour, you can add less or more water.
Making spring roll wrapper
Now on a low flame, heat a nonstick pan. The pan should just become slightly hot and not too hot. You can also use a cast iron or steel pan. But make sure they are well-seasoned.
With a paper tissue or a small piece of kitchen towel dipped in oil, grease the pan. For the nonstick pan you can skip greasing with oil. But if you feel the wrappers are sticking then grease or brush the pan evenly with oil.
Now lift the pan above the stovetop burner. Add 2 tablespoons of the batter at once in the pan. So use a spoon in which 2 tablespoons of the batter can fit in. You can also make larger sized wrappers using 3 to 4 tablespoons of the batter.
Gently, spread the spoon clockwise to make a small thin crepe. Similar to the way we make dosa. Now keep the pan on the stovetop on a low heat. Add 1 to 2 tablespoons more water if the batter becomes thick while preparing the wrappers.
Do remember that the crepes have to be thin. If they become thick, then they break while rolling and sealing.
On a low heat cook the crepe (spring roll wrappers) till the sides start curling up and the crepe becomes kind of translucent.
The crepe just need to be about cooked. No need to flip and cook the other side. Just cook one side.
Lift the spring roll wrapper with a spatula.
Place the spring roll wrapper in a tray or plate with the cooked side facing you.
Make the spring roll sheets in batches this way.
Allow the spring roll sheets to cool first and then stack them with the cooked side on top. Keep them covered in a small casserole or bowl, so that they do not dry out.Do not stack them when they are hot, as they will stick to each other.
Storage
Once the spring roll wrappers come at room temperature, you can start making the spring rolls. Or else keep them covered in a container in the fridge.
When keeping in the fridge, place parchment paper or butter paper between two sheets, so that they can be separated easily.
You can also keep these spring roll sheets either in the fridge or in the freezer.
In the fridge, these wrappers stay good for a week and in the freezer up to a month. After removing from the freezer, thaw them completely at room temperature before using.
Notes
The batter that you make for these wrappers has to be flowing, slightly thin, smooth and without lumps. Adjust the quantity of water as per the texture and quality of flour.
Swap cornstarch with tapioca starch, potato starch and arrowroot flour.
In case the batter turns thick while preparing the wrappers, add 1 to 2 tablespoons more water in the batter.
The crepes that you spread on the pan to make the sheets, should be thin. Making them thick can cause breaking of the wrappers while rolling and sealing.
The wrappers have to be just about cooked. Cooking them for more time or overcooking will make them dry, chewy and difficult to roll and seal.
Try not to use a heavy weighted pan or skillet as you will have to lift it every time you make the wrappers.