We often observe that when vegetables taken directly from the refrigerator are cooked on the stove, they take longer to cook compared to vegetables at room temperature. This is a common issue, and there are several scientific reasons behind it. Let's understand this concept in simple terms.

1. **Low Temperature**
Vegetables are stored at very low temperatures inside the refrigerator. When you place them directly onto the stove to cook:
*   First, the vegetables must reach room temperature.
*   Only after that does the actual cooking process begin.
In other words, the heat from the stove is initially expended solely on "warming up" the vegetables, which results in a longer cooking time.

2. **Increased Moisture**
Vegetables tend to accumulate moisture while being stored in the refrigerator.
Due to the cold, the vegetables become slightly wet.
During cooking, this excess water must evaporate first.
This causes the vegetables to take longer to cook, and sometimes they end up boiling rather than sautéing or frying.

3. **Cell Contraction**
At cold temperatures, the cells within vegetables contract.
When you heat them, these cells gradually expand.
This process takes time.
Consequently, the vegetables do not soften immediately, leading to delays in cooking.

4. **Reduced Effectiveness of Heat**
When you add cold vegetables to a pan or wok, the temperature of the vessel drops suddenly.
As a result, the heat from the stove becomes less effective.
It takes time for the temperature to rise back up again.
This factor also contributes to a slower cooking process.

5. **Improper Cooking of Spices**
Adding cold vegetables prevents the spices from sautéing or roasting properly.
The spices may remain undercooked.
The overall flavor of the dish is also compromised.
Until the temperature stabilizes, neither the vegetables nor the spices will cook correctly.

**Simple Tips for Faster Cooking**
*   Take the vegetables out of the refrigerator and let them sit at room temperature for 10–15 minutes before cooking.
*   Allow them to warm up slightly to room temperature before you begin the cooking process. First, heat the pan thoroughly.
Do not add very cold vegetables directly.
If necessary, keep the heat high initially.

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