3 roast beef and horseradish finger sandwiches Recipes

ripe california avocado (preferably hass), fresh lemon juice, fresh chives, minced, kosher salt, fresh ground black pepper, white bread (very thin slices , pepperidge farms is what we used), mayonnaise, prepared horseradish, purchased thinly sliced roast beef or 1/2 lb premade thinly sliced rare roast beef

sour cream, prepared horseradish, lemon juice, salt, pepper, crusty bread, sliced 1/4 inch thick, olive oil, roast beef, sliced thin, romaine lettuce