Spread the mayonnaise on one side of two of the slices of bread.
Spread the yellow mustard onto the other side of the two slices of bread.
Layer the roast beef, American cheese, and pickles onto the mustard side of one of the slices of bread.
Place the other slice of bread on top of the sandwich, mayonnaise side down.
Melt the butter in a skillet over medium heat.
Once the butter is melted, place the sandwich in the skillet and cook for 3-4 minutes on each side, until the bread is golden brown and the cheese is melted.
Remove the sandwich from the skillet and allow to cool for a few minutes before serving.
Interesting Facts
The American sandwich was created in the late 19th century by a man who owned a restaurant in New York City.
The American sandwich is often referred to as a “grilled cheese”, due to its similarities to the classic grilled cheese sandwich.
The American sandwich has been featured in several movies and television shows, including the classic sitcom Seinfeld.