After fermentation, the batter will have risen and become slightly airy. Give it a gentle stir.
Heat a non-stick or cast-iron skillet over medium-high heat. Sprinkle a few drops of water onto the skillet. If the water sizzles and evaporates immediately, the skillet is ready.
Pour a ladleful of the dosa batter onto the center of the skillet.
Using the back of the ladle, spread the batter in a circular motion to form a thin, even layer.
Drizzle a teaspoon of oil around the edges of the dosa and a few drops on top.
Cook the dosa for 2-3 minutes, or until the edges start to lift and crisp up.
Flip the dosa using a spatula and cook for another 1-2 minutes, or until it turns golden brown and crispy.
Repeat the process with the remaining batter, adjusting the heat as needed to prevent burning.