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A collage of six mustard images: Seeds of the mustard plant (top left) may be ground (top right) to make different kinds of mustard. The four mustards pictured are a simple table mustard with turmeric coloring (center left), a Bavarian sweet mustard (center right), a Dijon mustard (lower left), and a rough French mustard made mainly from black mustard seeds (lower right).

Image credit: Rainer Zenz