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1
Combine cumin seeds, coriander seeds, black peppercorns, cardamom pods, cloves, cinnamon stick, mace, and black cumin seeds in a small, dry skillet over medium heat.
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2
Toast for 4–5 minutes, stirring constantly, until the spices are fragrant and slightly darkened; transfer to a plate to cool completely.
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3
Grind the cooled spices to a fine powder using a spice grinder, mortar and pestle, or high-powered blender in short pulses, wiping down the sides as needed.
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4
Pass the powder through a fine-mesh sieve to remove any fibrous pieces; store in an airtight, opaque container away from heat and light for up to 3 months.