Tewkesbury mustard is a blend of mustard flour and grated horseradish root. The mustard was developed in the English town of Tewkesbury in Gloucestershire, and gained a certain reputation in the 17th century, becoming a staple condiment of the kitchens of the time. Shakespeare mentions the mustard in Henry IV, Part 2, in which Falstaff has the line: “his wit's as thick as Tewkesbury Mustard” (Act 2, Scene 4, Line 244), describing the character of his friend Ned Poins.