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If using whole coriander and cumin seeds, toast in a small skillet for 1 minute or until fragrant.
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Add toasted seeds (or ground coriander and cumin, if using) to blender along with onion, garlic, ginger, cinnamon, turmeric, red pepper flakes, and yogurt. Blend until smooth.
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Taste and adjust spices if necessary.
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Pour in the lime juice and other liquid from the chicken (leaving chicken in the bowl) and blend until smooth.
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Pour all contents of the blender into the bowl with the chicken (alternatively, marinate in large ziploc bags).
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Marinate chicken in the fridge for 24-72 hours.