Different species of the mustard plant produce different colored seeds.
Mustard is a condiment that comes from the seeds of mustard plants. The process for making mustard begins with crushing seeds to a specific consistency then adding wine, water, vinegar, or beer, as well as salt and spices. Whole grain mustard seeds, however, aren't ground. Many mustard lovers enjoy the rich flavor and thick texture this produces. Any one of the four types of whole grain mustard pairs particularly well with ham, pastrami, and roasted pork.
Brown
Brown whole grain mustard comes from Brassica juncea, a native Himalayan plant. According to Purdue University, healers in India use this mustard as an arthritis treatment. The seed color varies from light tan to dark brown. People in the United States sometimes refer to whole grain brown mustard as deli mustard. It tastes spicier than yellow mustard.
White
White mustard seeds come from the Sinapis alba plant, also native to the Mediterranean. The seeds from Sinapis alba are a light tan color. After preparation this whole grain mustard has a very mild flavor. Manufacturers use this particular seed for making "ballpark" style mustard.
Black
Black
Yellow
Yellow mustard