Nigella seeds, also known as kalonji seeds or black cumin, are small, black seeds obtained from the Nigella sativa plant, which is native to South Asia. Here's a concise description:

1. Appearance: Nigella seeds are tiny and angular with a triangular shape. They have a matte black color and are often mistaken for black sesame seeds.

2. Texture: The texture of nigella seeds is crunchy and slightly chewy when bitten into.

3. Taste: Nigella seeds have a unique, pungent flavor that is slightly bitter and peppery, with hints of onion, oregano, and black pepper.

4. Uses: Nigella seeds are commonly used as a spice in various cuisines, particularly in South Asian, Middle Eastern, and North African cooking. They are often sprinkled on bread, pastries, and savory dishes or used as a seasoning in curries, lentil dishes, and vegetable stir-fries. Nigella seeds are also used in pickling and as a flavoring agent in certain cheeses.

5. Health Benefits: Nigella seeds are believed to have several health benefits, including anti-inflammatory, antioxidant, and antimicrobial properties. They have been used in traditional medicine for centuries to alleviate various ailments, such as digestive issues, respiratory problems, and skin conditions.

6. Storage: Nigella seeds should be stored in an airtight container in a cool, dry place away from direct sunlight to maintain their flavor and aroma.

Overall, nigella seeds are prized for their distinctive taste and aroma, as well as their potential health benefits, making them a valuable addition to the spice cabinet in many culinary traditions.