Beef tongue (also known as neat's tongue or ox tongue) is a cut of beef made of the tongue of a cow. It can be boiled, pickled, roasted or braised in sauce. It is found in many national cuisines, and is used for taco fillings in Mexico and for open-faced sandwiches in the United States. In France and Belgium it is served with Madeira sauce, while chrain is the preferred accompaniment in Ashkenazi and Eastern European cuisines. Germans make white roux with vinegar and capers, or horseradish cream, which is also popular in Polish cuisine.