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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 notoriety 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.
Originally the mustard was prepared by grinding the mustard seeds into mustard flour, combining this with finely-grated horseradish (and sometimes herbs and spices), then forming the mixture into balls which were then dried to aid preservation. The mustard balls would then be transported and sold in this form.
To use the balls they would be broken apart then mixed with a liquid such as water, vinegar, wine, ale, beer, cider or fruit juice to soften them and mixed to a thick, creamy consistency. Often a sweetener such as honey would be added.
The resulting mixture would then be used as a condiment just as mustard is used today, or as a cure for ailments.
At the time of the Tewkesbury Festival in 1971 (a major programme of events commemorating the 850th anniversary of the consecration of the Abbey and the 500th anniversary of the Battle of Tewkesbury), the mustard was recreated on a commercial basis from the original recipe, though it is not made in Tewkesbury. Handmade mustard using local ingredients can still be purchased in Tewkesbury. The mustard can still be bought in ball format and even covered in gold leaf.
There are now several manufacturers producing the mustard and it is readily found in Tewkesbury’s shops and the local mustard company 'The Tewkesbury Mustard Company' online. Fortnum & Mason in London and Waitrose supermarkets sell their own-label jars of it.
There is some evidence that “Tewkesbury Mustard” came to be used as slang for incendiary 'fire-balls', a usage referred to in David Hume's History of England, in which he describes the rumour that the Great Fire of London was started by foreign arsonists trained by Jesuits "and the whole plan of operations was so concerted, that precautions were taken by the Jesuits to vary their measures, according to the variation of the wind. Fire-balls were familiarly called among them Tewkesbury mustard pills". Robert Hugh Benson’s refers to this in his historical novel Oddfish!, which contains the text: “Workmen, too, were set to search and dig everywhere for "Tewkesbury mustard-balls," as they were called—or fire-balls, with which it was thought that the Catholics would set London a-fire”. A similar line also appears in Alfred Marks' book Who Killed Sir Edmund Godfrey?.
Thomas Firminger Thiselton-Dyer in his book “The Folk-lore of Plants” (pub. 1889) gives evidence that the phrase “He looks as if he lived on Tewkesbury mustard” came to be used as slang in Gloucestershire for those "who always have a sad, severe, and terrific countenance".
In Shakespeare's Henry IV, 2. part, Falstaff says: "He a good wit? Hang him, baboon. His wit’s as thick as Tewksbury mustard. There’s no more conceit in him than is in a mallet" (Act 2, scene 4).