The water content of curry leaves affects tempering by causing splattering and potentially steaming the spices instead of frying them, which can reduce their flavor impact. Drier leaves temper more effectively.
Tempering, also known as 'tadka' or 'chaunk,' is a crucial technique in Indian cooking where spices are briefly fried in hot oil or ghee to release their aroma and flavor. When curry leaves, which naturally contain moisture, are added to hot oil, the water quickly turns to steam. This rapid vaporization causes the oil to splatter, posing a safety hazard. More importantly, the steam can prevent the spices from properly frying and releasing their essential oils. Instead of a deep, rich flavor infusion, you might end up with a slightly steamed, less potent result. The ideal scenario is for the curry leaves to sizzle and crisp up quickly in the hot oil, imparting their unique flavor to the dish. Therefore, the drier the curry leaves, the better they will temper.
To reduce splattering and improve tempering, gently pat your curry leaves dry with a paper towel before adding them to the hot oil. You can also briefly dry them in a low-heat oven or microwave to remove excess moisture.