Killer Roast Beef Sandwich

For one sandwich:
1 onion roll, split
Spread each half with mayo and horseradish, to taste

Take bottom roll and layer with good quality deli roast beef slices, spinach, arugula or lettuce, cheddar cheese, thinly sliced red onion, fresh tomato, sprinkle of salt and pepper. Top with other half of onion roll.

YUMMY!!!!!