More a way of life then a recipe
Toast some onion rolls. Combine about 4 Tbl mayo with 1 tsp grated horseradish. Use this to mixture to “butter” your rolls. On each sandwich put several slices of thinly carved medium rare roast beef. You’ll want to sort of fold them so that they are in “ruffles” and don’t just lay there like a carnivorous pancake. Now, if you are going to eat immediately, add some sliced tomatoes and butter lettuce. Iceberg is all wrong for these sandwiches. Apply salt and paper. If you are taking these monstrosities to consume elsewhere, bag the veggies and assemble sandwiches when you are ready to chomp