Sentence:  Congressmen gleefully wolfed down every imaginable version of the hot dog – smoked kielbasas, jumbo grillers, Big & Juicy's, kosher dogs and spiced dogs – topped with every imaginable condiment – hot mustard, sweet mustard, jalapenos, spaghetti sauce, regular relish, corn relish, maple syrup salsa and the <WSD>secret sauce</WSD> of Rep. w 
Meaning of the word marked with <WSD> tags:  A sauce used in cooking or as a condiment, the ingredients of which are kept secret.