Ingredients
Method
- Heat oven to 350°F; line a baking pan with parchment.
- Mix mayonnaise, horseradish, and Dijon.
- Split rolls as one slab. Spread horseradish mixture on bottom; layer with roast beef and Swiss.
- Replace tops; brush with butter mixed with black pepper.
- Cover; bake 14 minutes. Uncover; bake 5 minutes until beef reaches 165°F and tops brown.
- Rest 5 minutes; cut along seams.