No, tempering, also known as 'tadka' or 'chhonk,' is not necessary in every Indian dish, but it is a common technique used to enhance flavor and aroma.
Tempering involves heating oil or ghee and then adding whole spices, dried chilies, and sometimes other ingredients like ginger, garlic, or asafoetida (hing). The hot oil extracts the essential oils from the spices, releasing their aroma and flavor. This flavorful oil is then added to the dish, either at the beginning or at the end of cooking.
While tempering adds a distinct and delicious dimension to many Indian dishes like dals, curries, and vegetables, it's not a universal requirement. Some dishes rely on other flavor-building techniques, such as using spice pastes, marinades, or simply allowing spices to bloom directly in the cooking liquid. The necessity of tempering depends entirely on the specific recipe and the desired flavor profile. Some dishes are intentionally made without tempering to achieve a lighter or fresher taste.
Be careful not to burn the spices during tempering, as this will result in a bitter taste. Heat the oil gently and add the spices in the order specified in the recipe, as some spices require less cooking time than others.