Originally posted September 12, 2016. Updated November 6, 2026 for content and clarity. Roast beef horseradish party sliders are the perfect bulk-made, insanely delicious sandwiches that are perfect sliders for any gathering. Sweet hawaiian rolls are the base, quick and easy, and sliced as one big block of bread to keep things quick and easy. Layer on cheese, caramelized onions, roast beef, and a generous smear of horseradish aioli for a delicious, tangy bite! Plus, as an added bonus, roast beef horseradish party sliders are easy to make ahead, but by baking them for a few minutes before serving, they’re…