Bordeaux Mustard is made from brown or black unhusked mustard seeds ground into a fine flour, mixed with sugar, tarragon, and white verjuice. It has a sweet taste (sweeter than Dijon) with just a tang of sourness to it. The heat is relatively mild. The mustard is a pale yellow colour (though darker than Dijon.)
Though not used as often in cooking as Dijon mustard is, Bordeaux goes well as a condiment on sandwiches.