Toss the beef with as much horseradish mayonnaise as you like to season and moisten the beef. If you have no mayonnaise leftover, then toss with a vinaigrette to which you add mustard and some horseradish. Fold in the peppers and season to taste with salt and pepper. Center the beef on a bed of watercress or arugula leaves lightly tossed with olive oil.
Recipe Courtesy of �Michelle Urvater