Click the link up above to see the slow-roasted beef with creamy horseradish sauce recipe.
Toast the slider bun halves in a toaster oven or preheated 350-degree oven until slightly golden.
Slather some leftover creamy horseradish sauce on each slider bun.
Top one bun with roast beef, sharp white cheddar, a handful of arugula, and a bit of sea salt and freshly cracked pepper, to taste.
Top with the remaining bun and serve immediately. Enjoy.