1-First Step: Gather and Prep Ingredients Collect all items you’ll need: thinly sliced roast beef, rustic bread, horseradish sauce, fresh arugula, butter, salt, and pepper. Ensure the roast beef is sliced thinly for easy layering and toastability. Pat arugula dry if needed to prevent sogginess.

2-Second Step: Butter and Toast the Bread Preheat a skillet over medium heat. Spread a thin layer of butter evenly on one side of each bread slice. Place the slices butter-side down onto the skillet and toast for 2-3 minutes, or until golden and crisp. Flip and toast the other side briefly if desired.

3-Third Step: Assemble the Roast Beef Toast Stack Remove the toasted bread from heat. Spread horseradish sauce evenly over the toasted side of two slices. Layer the thinly sliced roast beef generously on these slices. Add fresh arugula atop the beef, seasoning lightly with salt and pepper to taste.

4-Fourth Step: Complete the Stack Top the roast beef and arugula layers with the remaining bread slices, pressing down gently to create a firm stack. For extra warmth, you can return the assembled stack to the skillet to grill briefly, allowing the flavors to meld and the bread to crisp further without burning.

5-Final Step: Slice and Serve Cut the roast beef toast stack diagonally for easier handling and an attractive presentation. Serve immediately, optionally accompanied by pickles, a light salad, or fresh fruit for a balanced meal.