Black cumin seeds or common jeera – one of the spice seeds recommended as useful to boost immunity during coronavirus times! But here’s a confusion because there’re several kinds of cumin seeds ranging from our familiar jeera as also a darker, smaller version called kala jeera (Bunium bulbocastanum). Cumin, black cumin, black onion seeds (kalonji), black sesame, even lovely fennel fat and slender, they’re all seeds of herbal plants in Mother Earth’s medicinal cupboard. Study up on their properties first before self-diagnosing yourself of whatever ails you! Kalonji (Nigella sativa plant seeds) are sometimes referred to as black cumin too, but they’re just the black seeds of a plant of the buttercup family of flowering plan (in Persian kalonji is “shonaiz” and used for flavoring many recipes).