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REFRIGERATION

Food storage

How to store idli and dosa batter

Idli and dosa batter is a fermented mix of rice and urad dal. Fermentation at warm temperatures creates the bubbles and sour flavour; after that, the batter needs to be chilled to slow further fermentation. Batter left warm too long becomes overly sour, thin and smelly, and may grow unwanted yeasts and moulds. Once fermented, batter should be stored at 0 to +4 °C, in clean covered containers, and used within the period your food-safety plan sets. Packaged batter must be kept chilled and used by its date.

  • Chilled0 to +4 °C (after fermentation)

Do

  • Grind and ferment batter in clean, sanitised containers, using potable water.
  • Check fermentation and chill the batter as soon as it has risen enough.
  • Store batter in covered containers with some headspace; it can continue rising in the fridge.
  • Take out only the quantity needed for the next round of service; keep the rest chilled.
  • Stir gently before use; do not add water to the whole batch, only to the portion you are using.
  • Label each batch with the date and time it was ground and chilled.
  • Clean wet grinders thoroughly after every use.

Avoid

  • Do not leave fermented batter at room temperature through a long service in summer.
  • Do not mix old batter into new batter.
  • Do not use batter that smells alcoholic, rotten or shows pink or black mould.
  • Do not ferment batter in metal containers that react with acid.

In Indian conditions

In South India's hot and humid climate, batter ferments fast, sometimes in a few hours. Restaurants and tiffin centres often grind daily, which is the best practice. Packaged batter is sold widely in Indian cities; it must be displayed in a glass-door cooler or chilled cabinet, not on an ambient shelf. During power cuts, batter keeps fermenting and can become too sour to use; prioritise it for cold space. In winter or air-conditioned kitchens, fermentation takes longer, so adjust timing rather than leaving batter out indefinitely.

General good practice for commercial kitchens and shops. Where your FSSAI licence conditions or food-safety plan set stricter limits, follow those.