How to tell if idli batter is properly fermented?

Question

Learn the key signs that show idli batter has fermented correctly and is ready to steam.

Answer 1

Properly fermented idli batter will have increased in volume, have a slightly sour aroma, and be light and airy with tiny bubbles throughout. The batter should also float a small spoonful in water.

Detailed Explanation:

Fermentation is key to making soft and fluffy idlis. Here's how to check if your batter is ready:

1. Volume Increase: A well-fermented batter will have noticeably increased in volume, typically doubling in size. This is due to the production of carbon dioxide by the microorganisms during fermentation.

2. Aroma: The batter should have a mildly sour and pleasant aroma. This sourness is a result of the lactic acid produced during fermentation. A foul or overly pungent smell indicates over-fermentation or spoilage.

3. Texture: The batter should be light and airy. You should see tiny bubbles distributed throughout the batter. This bubbly texture contributes to the softness of the idlis.

4. Float Test: Take a small spoonful of the batter and gently drop it into a bowl of water. If the batter floats, it indicates that it's well-fermented. If it sinks, it needs more time to ferment.

Pro Tip:

If your batter hasn't fermented properly, try placing it in a slightly warmer location (around 80-85°F or 27-29°C). You can also add a pinch of baking soda to help it rise, but be careful not to add too much, as it can affect the taste and texture of the idlis.