Mustard seeds are small, round seeds that grow on shrubs and come in a variety of colors, including yellow, brown, and black. They are usually about 1–2 millimeters in diameter and have a spherical or oval shape. Mustard seeds are finely pitted and odorless when whole, but have a pungent taste.
The color of the seeds indicates their flavor, with yellow seeds having the mildest flavor, brown seeds being slightly more pungent, and black seeds being the most pungent. However, black seeds are rare and are often substituted with brown seeds.
Mustard seeds come from two large shrubs native to Asia: Brassica juncea (brown mustard) and Brassica hirta (white mustard). Both plants produce bright yellow flowers that contain the seeds.
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