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Cereals and bread from India
Pazhaya sadam is cooked rice, usually the day's leftover rice, covered with water and left overnight so that it ferments lightly. In the morning the soft, faintly sour rice is eaten, often with curd, onion and green chilli.
| Rice (Ponni variety)100 g | Soaked 30 min, then cooked[kowsalya2022] |
| Water for cooking, with a little salt250 ml | Excess cooking water drained off[kowsalya2022] |
| Water to cover the cooked rice | [kowsalya2022][thendral2026] |
| Curd, small or big onion and green chilli (optional) | 40% of surveyed households ate it with all three[thendral2026] |
| Starter | spontaneous |
Total time across the recorded steps: 13 h
What changes: Raw rice soaks in water for half an hour before it is cooked
Output: soaked raw rice.
Microbes at work in this step
Not documented for this step.
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
Pazhaya sadam is cooked rice, usually the day's leftover rice, covered with water and left overnight so that it ferments lightly. In the morning the soft, faintly sour rice is eaten, often with curd, onion and green chilli. Made in 4 steps over 13 h. The longest step, cover the cooled rice with water and leave overnight, takes 12 h (Thendral S.T 2026) and runs at 30 °C (Kowsalya M. et al. 2022). Pediococcus pentosaceus and Lactiplantibacillus plantarum, identified from naturally fermented rice gruel of South India and Leuconostoc lactis and Weissella confusa, identified in overnight-soaked cooked rice do most of the fermenting.
| Main step | 12 hReported[thendral2026] | Cover the cooled rice with water and leave overnight |
|---|---|---|
| Temperature | 30 °CReported[kowsalya2022][afrin2024] | Cover the cooled rice with water and leave overnight |
| Acidity | pH 7.3 → 4.86Measured[kowsalya2022][afrin2024] | Cover the cooled rice with water and leave overnight |
Pazhaya sadam soaks cooked rice in plain water overnight, like Bengali panta bhat. In Tamil Nadu it is usually made from parboiled rice and eaten with curd, onion and green chilli.
The soak is short and only mildly acid (pH 6.5 in one South Indian laboratory batch, 4.86 after 12 h in a panta bhat study), so it is not a preserving ferment; households eat it the next morning. FDA says Bacillus cereus grows best at 28 to 35 °C and can grow between pH 4.9 and 9.3. It says the toxin behind the vomiting type of illness most often affects rice and other starchy foods, and that cooking may not disable it. FDA advises keeping food at 40 °F (4 °C) or lower.
Every number is labelled with how it is known. How this atlas is made
In rural Tamil Nadu pazhaya sadam is tied to the idea of unava marunthu, food as medicine, and is valued as a cooling breakfast before farm work.
