If you don't have mustard seeds, you can use black peppercorns, cumin seeds, or asafoetida (hing) as substitutes in tempering. These alternatives offer similar flavor profiles and aromatic qualities.
Tempering, also known as 'tadka' or 'chhonk,' is a cooking technique common in Indian cuisine where spices are briefly roasted in hot oil or ghee to release their flavors. Mustard seeds are frequently used for their pungent, nutty flavor and characteristic popping sound. When mustard seeds are unavailable, several substitutes can be used, each offering a slightly different but complementary flavor profile:
When using any of these substitutes, heat your oil or ghee over medium heat. Add the substitute and cook until fragrant, being careful not to burn it. Then, proceed with the rest of your recipe.
If you're using asafoetida, dissolve a tiny pinch in a teaspoon of water before adding it to the hot oil. This helps to distribute the flavor more evenly and prevents it from burning.