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"Onion seeds" can refer to two different things: the small black seeds of the Nigella sativa plant, commonly called kalonji or black cumin, and the seeds of the common onion plant (Allium cepa), used for starting new onion plants. The black kalonji seeds are used as a spice in cooking and have a slightly bitter, peppery flavor, while the Allium cepa seeds are primarily for cultivation.