Roast Beef Sandwich - cooking recipe

Ingredients

3/4 cup mayonnaise (I use Hellman's)
3 tablespoons horseradish
3/4 lb roast beef (preferably rare)
softened butter
lettuce leaf
vidalia onion, slices
tomatoes, slices
4 kaiser rolls

Preparation

Combine mayo with horseradish.
Butter rolls - this is important as the butter makes a 'lining' to prevent the roll from getting too soggy, and it tastes good too.
Fill rolls with layers of remaining ingredients.
Season roast beef with lots of salt and freshly ground pepper.
Top with mayonnaise.