I searched for “plumber’s bread” on DuckDuckGo and this was the 3rd result which seems to match what you’re looking for - https://www.finehomebuilding.com/forum

I searched for “plumber’s bread” on DuckDuckGo and this was the 3rd result which seems to match what you’re looking for - https://www.finehomebuilding.com/forum/plumbers-bread-sandwich-anyone https://www.finehomebuilding.com/forum/plumbers-bread-sandwi.... I do see the other kind of results you’re talking about too, though.