Good Guess, but it was actually DeMarini’s on Wentworth & Potter, (up the hill from the coast guard station) it was also known as Mama DeMarinis for the last decade or so. The only court case I know of that was about Italian Sausage and who had the original recipe. The Caradaro Club also used canned exclusively, they were out in Muskego for a while, then they changed names and went to 35th & Oklahoma, Ingrilli’s also used canned shrooms, heck, up until the 1990’s, every pizza place i can think of in or around Milwaukee used cannedI think that pizza place in Milwaukee is called The Calderone Club. Great pizza years ago when Mama Rosa ran the place on Oakland and North.
Unless you add green & black olives to it,Nothing beats a Pep & Shroom(Fresh) Pie…my personal fav!