English Mustard is made from the hotter brown mustard seeds blended with the milder yellow mustard seeds, plus some wheat flour and perhaps a tiny amount of turmeric for colour. English Mustard is used as an accompaniment to roast beef, boiled ham, burgers, steak, sausages and pork pies. English mustard is also used with Welsh rarebit, a toasted cheese dish. English Mustard is sometimes still made fresh from mustard powder with some water, and can be truly hot - this is its special character.
Dowell, P., Bailey, A. (1980) The Book of Ingredients, Dorling Kindersley. ISBN 0718119150.