The ideal oil temperature for tempering mustard seeds is moderately hot, around 300-350°F (149-177°C). This allows them to pop and release their flavor without burning.
Tempering spices involves heating them in oil or ghee to release their essential oils and enhance their flavor. For mustard seeds, the goal is to achieve a popping sound, indicating that they are releasing their pungent aroma and flavor. If the oil is not hot enough, the seeds will simply sit in the oil without popping. If the oil is too hot, the seeds will burn quickly, resulting in a bitter taste.
Here's a step-by-step guide:
Always add mustard seeds to a dry pan before adding the oil. This helps prevent them from sticking to the pan and burning unevenly.