2 teaspoons of lemon juice
1 small apple, finely chopped
one 3 ounce package of cream cheese
1 tablespoon of milk
1 tablespoon of prepared horseradish
1/4 cup of walnut pieces
6 Kaiser rolls, split
6 Lettuce leaves
1 pound of thinly sliced roast beef
2 tablespoons of sliced green onions