Overview
Mustard is a condiment made from the seeds of a mustard plant (white/yellow mustard, Sinapis alba; brown mustard, Brassica juncea; or black mustard, Brassica nigra).
The whole, ground, cracked, or bruised mustard seeds are mixed with water, vinegar, lemon juice, wine, or other liquids, salt, and often other flavorings and spices, to create a paste or sauce ranging in color from bright yellow to dark brown. The seed itself has a strong, pungent, and somewhat bitter taste. The taste of mustard condiments ranges from sweet to spicy.
Mustard is commonly paired with meats, vegetables and cheeses, especially as a condiment for sandwiches, hamburgers, and hot dogs. It is also used as an ingredient in many dressings, glazes, sauces, soups, and marinades. As a cream or as individual seeds, mustard is used as a condiment in the cuisine of India and Bangladesh, the Mediterranean, northern and southeastern Europe, Asia, the Americas, and Africa, making it one of the most popular and widely used spices and condiments in the world.
Etymology
The English word "mustard" derives from the Anglo-Norman mustarde and Old French mostarde. (Modern French is moutarde.) The first element is ultimately from Latin mustum, ("must", unfermented grape juice)—the condiment was originally prepared by making the ground seeds into a paste with must or verjuice. It was first attested in English in the late 13th century, though it was found as a surname a century earlier.
From Wikipedia (CC BY-SA 4.0).