How is Idli prepared?

Explanation

### Step-by-Step Solution for Preparing Idli

1. **Understanding Idli**: Idli is a popular South Indian food item that is made through a natural fermentation process.

2. **Ingredients**: The primary ingredients for making idli are rice and black gram (urad dal).

3. **Soaking**:
- Soak the rice and black gram together in water for about 18 to 30 hours.
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