Instructions:
Preheat the oven to 350°F.
Brush the egg whites over the tops of the Kaiser rolls and sprinkle with the salt and caraway seeds. Place on a baking sheet and bake until golden brown, about 10 minutes.
Remove and set aside.
In a large saucepan, combine the beef stock or au jus and the shaved roast beef and cook over low heat until completely warmed through.
Slice the rolls in half. Spread the top halves with the sandwich spread and the bottom halves with the horseradish sauce and place on a griddle until golden brown.
Pile a generous portion of the roast beef onto the bottom halves of the rolls and cover with the top halves.
Serve with a leaf of lettuce, slice of tomato, pickle spear, some of the stock or au jus on the side, and macaroni salad.