You can find roasted cumin powder in specialty stores or online, but it’s easy to make your own and much more fragrant than store-bought. To do it, toast whole cumin seeds in a dry pan over medium-high heat, shaking the pan frequently, until they start to color, 1 to 2 minutes. Transfer them to a plate to cool. Grind the seeds in a spice grinder or with a mortar and pestle. You can make a larger quantity and store it in a tightly sealed jar.