- Stir together mayonnaise, horseradish, and pepper in small bowl. Spread about 1 1/2 teaspoons of mayonnaise mixture on each slice of toast.
- Top each of 4 slices of toast with 2 slices roast beef, 4 tomato slices, and 1/2 cup arugula. Cover with remaining slices of toast.
- Per serving: 1 sandwich
To make these sandwiches gluten free, use 4 slices of gluten-free bread and make the sandwiches open face. Using 1 slice of gluten-free bread per serving will up the per-serving SmartPoints by 1.