according to Davydd it doesn't exist!
For one thing it is hotdish
in Minnesoohta not casserole. Just a different name. You gotta get with the joke if you want to discuss it, you betcha. Casserole is a traditional church supper or bring around to the widow by the neighbor offering same as about anywhere else in the country. The Tater Tot
is an invented processed food by Ore-Ida in 1953, not in Minnesota but in Oregon. Baby Boomer humorists, including Garrison Kiellor, Howard Mohr, and couple of recent cook book writers have picked up this combination and emphasized it to poke some fun--something for the Barnes & Noble regional book shelf. Then out of towners from New York City to Rhode Island come to Minnesota actually seeking this dish out in restaurants as roadfood, and of course, out of the thousands of restaurants a few will pick up on the promotion, especially for out of staters and now seemingly younger people who know nothing but processed food. If you are looking for authentic Minnesota immigrant settler food grandmother made, this isn't it. Grandmother died before Tater Tots were invented.
Darn, I could have had Tater Tots with my last sandwich but instead opted for sweet potato fries, another hot food item supposedly growing out of the South.