Mmmmm, that looks so good! Took our nephews to the Cubs game last weekend. After a little searching, I finally found a concession stand selling the Wrigley Smokie, something I haven't had in a few years because they keep moving things around. Covered in mustard, grilled onions, tomato, and sport peppers. It may even have been worth the 15 min wait in line due to silly COVID line re-configurations.

For any other searchers, it's sold at the stall in far right field, last food stand on that side.