Prime Rib French Dip Sandwich

Prime Rib Instructions:

1. Trim and tie the rib roast for even cooking.
2. Season with a coarse rub and leave in the fridge overnight.
3. Preheat oven/smoker to 225°F and coat with zesty horseradish paste.
4. Cook until the internal temperature reaches 123°F for rare/medium rare or 133°F for medium.
5. Let it rest for 30 minutes to an hour, then sear in the oven or use a torch for 5-10 minutes.

Steak Au Jus Sauce Instructions:

1. In a saucepan, combine beef broth, red wine, minced garlic, Worcestershire sauce, salt, and black pepper.
2. Bring the mixture to a simmer over medium heat and let it cook for about 10-15 minutes, allowing the flavors to meld.
3. Strain the sauce to remove garlic and other solids, leaving you with a smooth au jus sauce.

Sandwich Assembly:

1. Lightly toast sourdough bread slices.
2. Spread horseradish sauce on one side of the toasted bread.
3. Layer with fresh arugula, thin slices of the cooked prime rib, provolone cheese, and caramelized onions.
4. Garnish with fresh chives.
5. Serve immediately with a side of the warm au jus sauce for dipping.