The great art of mixing mustard is to have it perfectly smooth, and of a proper consistency. The liquid with which it is moistened should be added to it in small quantities, and the mustard should be well rubbed, and beaten with a spoon. Mix half a teaspoonful of salt with two ounces of the flour of mustard, and stir to them by degrees sufficient boiling water to reduce it to the appearance of a thick butter: do not put it into the mustard-glass until it is cold. Some persons like a half-teaspoonful of sugar in the finest powder mixed with it. It ought to be sufficiently diluted always to drop easily from the spoon; and to bring it to this state more than a quarter of a pint, and less than half a pint of liquid will be needed for four ounces of the best Durham mustard.
For Tartar mustard.