Secrecy surrounds Secret Stadium Sauce, the way the government keeps mum about Area 51.

This much is known about Milwaukee's famous sauce: Its top five ingredients are water, tomato paste, corn syrup, vinegar and high-fructose corn syrup. Beyond that, nobody knows what's in it, but everybody seems to want it.

Sports Illustrated recently named Miller Park, home of the Milwaukee Brewers, as serving the best food in Major League Baseball. Singled out for distinction: Secret Stadium Sauce.

We bought a bratwurst and chorizo sandwich, requesting ample SSS. How best to describe? It was barbecue sauce at 80 percent, ketchup with more chutzpah. It had the slight zing of Worcestershire sauce, a more acidic version of the Japanese tonkatsu sauce, with a barely there spice kick that tickled the tongue.