Well, I've got to say that growing up in Winona we always crossed the river into Wisconsin for those fish dinners. It became habit, first with my parents and later with my dates. We never looked deeper into Minnesota, always over that bridge, then there were dozens of places to choose from, and a 30 mile drive one way was just part of the evening. It was just natural to go east, and not just us, but everyone we knew. Cod and walleye both readily available, and AUCE was the rule on Friday.
Having said that, there were some memorable fish places in Minnesota, a couple in Winona and the Anderson House in Wabasha (still there)...but those are border towns.
But now I'm thinking about Minnesota being one of the healthiest states, and Wisconsin one of the fattest....maybe we can blame Wisconsin on the beer, or the cheese, or the brats, or.....LOVE OF LIFE!
Now we've spent 20 years in several Wisconsin cities, and you can't swing your arm without spilling some tartar sauce. But there are some differences within the state. We lived 10 years in Fond du Lac, and over there perch replaces walleye. Perch is everywhere (cod also) and walleye harder to find. And maybe taste is what you grow up with, but we could never warm up to the perch like we did to walleye.
But how about french fries and tarter? We grew up with that in Minnesota (border town) and it is just a natural expectation in Wisconsin. When we moved to Omaha in 1971 we found a place famous for chicken, and ordered fries as a side. The lady who took the order could not get over that we wanted tarter sauce with our fries. It was just wrong to her. But that was a long time ago. Maybe it's different now. How about Indiana?