Robuta

https://www.chowhound.com/1810279/secret-ingredient-egg-salad-steak-sauce/
Your egg salad is missing steak sauce. The tangy, umami flavor is the perfect combo for the eggs dressed in mayo and mustard. Here's how to add it to the dish.
egg saladone steakhouseaddboldflavor
https://www.tmj4.com/news/local-news/milwaukees-five-oclock-steakhouse-named-one-of-americas-best
It was the only one in Wisconsin to make the list.
mkesteakhousenamedoneamerica