Step 1: Mix and Ferment the Dough
In a large bowl, whisk together the flour, sugar, salt, and baking soda to combine.
In a separate, smaller bowl, mix the room temperature yogurt, vegetable oil, and 3. 2 oz / 90 g of the warm water.
Pour the wet mixture into the dry .
Stir with a spatula until a shaggy, messy dough comes together.
Turn the dough onto a clean counter and knead for about 8 minutes. The dough should transform into a silky smooth and pliable ball. If it feels too dry, add a teaspoon of water at a time. If it's sticky, add a light dusting of flour.
Lightly oil a plastic bag or a bowl with a lid.
Place the dough inside, press out any excess air, and seal.
Let the dough rest in a warm, draft-free spot for 8-12 hours, or overnight. You'll notice it expands slightly and develops a pleasant, tangy aroma.
Step 2: Shape the Roti
After resting, gently knead the dough for one minute.
Divide it into 14 equal portions, about 1. 2 oz / 34 g each.
Roll each piece into a smooth ball.
Arrange the dough balls on a plate, ensuring they don't touch, and cover them with a damp kitchen towel to keep them from drying out.
Begin preheating a cast-iron griddle or a heavy-bottomed skillet over moderately low heat for at least 3-5 minutes.
Step 3: Roll and Cook
Take one dough ball and flatten it into a 2-inch disc. Lightly dip both sides in flour.
On a lightly floured surface, roll the disc into a thin, even circle about 5 inches in diameter. Use minimal flour to prevent the roti from becoming tough.
Gently slap the rolled roti between your palms to dust off any excess flour.
Place the roti on the hot griddle.
Cook for about 90 seconds on the first side, until you see small bubbles forming and the color lightens.
Flip and cook for another 30 seconds on the second side.
Now, it's time to puff! For a gas stove, use tongs to hold the roti about 2 inches over a high flame until it puffs up like a balloon (10-15 seconds). For an electric stove, use a folded kitchen towel to gently press around the edges of the roti on the griddle to trap steam and encourage it to inflate.
Immediately transfer the puffed roti to a cloth-lined basket to keep it warm and soft. If you like, brush it with a little melted butter or ghee.
Repeat the rolling and cooking process with the remaining dough balls.