Upstate Roast Beef Sandwich w/ Fried Onions & Horseradish Mayo

Ingredients:

For the Roast Beef:

For the Sandwiches (makes 4–6):

Instructions:

  1. Season & Roast the Beef:
  • Preheat oven to 500°F (260°C).
  • Pat the roast dry and rub all over with salt, pepper, garlic powder, onion powder, and olive oil.
  • Place on a rack in a roasting pan. Roast at 500°F for 7 minutes per pound.
  • Turn the oven off, leaving the roast inside for 1.5–2 hours without opening the door.
  • Remove and let rest, then slice very thinly against the grain once cooled.
  1. Prep the Toppings:
  • While the roast rests, prepare caramelized onions by sautéing sliced onions in butter over low heat for 20–30 minutes until golden and sweet.
  • Mix together mayo and horseradish (or use a zesty mustard) for a bold spread.
  1. Build the Sandwich:
  • Lightly toast the rolls. Spread the horseradish mayo on both sides.
  • Pile on thin slices of roast beef, add cheese, onions, greens, and optional pickles or peppers.
  1. Serve:
  • Press the sandwich slightly and serve warm or cold with chips or a pickle on the side!