A flat, heat-resistant spatula, preferably made of wood or silicone, is best for stirring tadka. This allows you to scrape the bottom of the pan effectively and prevent burning.
Tadka, also known as tempering, involves heating oil or ghee and then adding spices to infuse the oil with their flavor. The spices are often added in quick succession and need to be stirred constantly to prevent them from burning. A flat spatula is ideal for this process because its shape allows you to easily scrape the bottom and sides of the pan, ensuring that all the spices are evenly heated and none are sticking and burning.
Wooden spatulas are a good choice because they are heat-resistant and won't react with the ingredients. Silicone spatulas are also excellent as they are heat-resistant, flexible, and easy to clean. Avoid using metal spatulas, especially on non-stick pans, as they can scratch the surface. A spatula with a long handle is also beneficial as it keeps your hand further away from the hot oil.
Before adding the spices to the hot oil, have them pre-measured and ready to go. This will allow you to add them quickly and efficiently, minimizing the risk of burning.