Open-faced sandwich originating in Springfield, Illinois, U.S.
The horseshoe is an open-faced sandwich originating in Springfield, Illinois, United States. It consists of thick-sliced toasted bread (often Texas toast), a hamburger patty or other choice of meat, French fries, and cheese sauce. 
While hamburger has become the most common meat on a horseshoe, the original meat was ham. The "horseshoe" name has been variously attributed to the horseshoe-like shape of a slice of bone-in ham, or to the horseshoe-like arrangement of potato wedges around the ham.
It is not uncommon to substitute other meat for the hamburger, such as chicken or ham, or use more than one type of meat. The fries may also be substituted with tater tots, waffle fries, or other forms of fried potatoes. 
Although cheese sauces vary by chef, it is generally derived from Welsh rarebit. Common ingredients include eggs, stale beer, butter, sharp cheddar cheese, Worcestershire sauce, flour, dry mustard, paprika, salt and pepper, and a dash of cayenne pepper.
A smaller portion, with one slice of bread and one serving of meat, is called a pony shoe.
A breakfast horseshoe is also available. The hamburger and french fries are replaced with sausage or bacon, eggs, and hash browns. The cheese sauce can also be substituted with milk gravy.
Ross' Restaurant in Bettendorf, Iowa, was known for a similar dish called the Magic Mountain before closing permanently in February 2023. Instead of a hamburger patty, the sandwich contains steamed loose meat. It has been enjoyed by politicians and celebrities including Barack Obama and Bette Midler.
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