Prepare the ingredients.
Whisk all-purpose flour, salt, sugar, and turmeric powder together in a large mixing bowl until well-combined.
Crack and add an egg, cooking oil and fresh milk to the mixing bowl. Whisk by until fully combined. The batter should be quite thick once combined.
Add 250ml of water to the batter and gently mix until incorporated and very thin. Optionally, add another 100ml if the batter is too thick. The batter should be as viscous as water, yet able to very thinly coat the back of the spoon.
Transfer the batter into a bottle with multiple dispensing holes.
Place a heat-proof chopping board next to the stove, and a non-stick pan over medium heat.
Without squeezing, pour the batter straight out from the bottle in a circular motion, until a net-like batter is formed. Cook on medium-low for about 25 seconds, or until the top part is no longer wet.
Tease the edges slightly with a silicone spatula, until about 60% of the crepe is released from the pan.
Flip the pan over the chopping board, and set it back on the stove. Pour another serving of the batter in a circular motion and let it cook for 25 seconds, or until the top is dry. Meanwhile, the crepe on the chopping board should be cooled enough to handle. Fold two opposite sides of the crepe inwards to form a rectangle. Roll the rectangle from the top to the bottom to get a long cylindrical shape. Set it aside on a serving plate.
Back to the crepe in the pan, tease the edges lightly with a silicone spatula, until it is about 60% released from the pan. Repeat the previous step until all the batter has been used.
Serve the stack of roti jala with some curry.