@Just Gina Just come to West-Central Illinois and you can go on a giant tenderloin tour. Spoonies in London Mills, IL, right on the Spoon River, is highly regarded. The Goose Pit in Banner, IL, between Banner Marsh and Rice Lake, just off the Illinois River, has a great one that comes on a single bun as a joke (it could be made into 4 nice sandwiches).
And while you’re in central IL, you could also start trying the legendary Horseshoe. The best I ever had was at Jackson Street Pub in Macomb, IL. Theirs was 2 slices of Texas toast, 2 breaded tenderloins (or hamburgers or chicken breast), then buried under a mountain of waffle fries and cheese sauce. Many others only do the single Texas toast and burger or tenderloin. I changed the life of a feller from Georgia one night with a horseshoe (and probably shortened his life, too).