The roast beef at Arby's is made from top round roast beef, which is a cut of beef that's taken from the rear section of the cow. This cut is leaner than other cuts, which makes it perfect for slicing thin and serving in a sandwich. Think of it like the filet mignon of roast beef, but without the hefty price tag.
Now, you might be thinking, "Okay, so it's just a piece of meat, what's the big deal?" Well, the big deal is that Arby's takes this top round roast beef and slow-cooks it in a special au jus sauce that's made with a secret blend of spices and seasonings. It's like a big hug for your taste buds, and it's what sets Arby's roast beef apart from the rest.