Step 1

For the prime rib: Preheat the oven to 350 degrees F.

Step 2

Place rib eye fat-side down in a roasting pan. Pour half of Worcestershire over the top, then sprinkle on half of the steak seasoning. Flip and cover with remaining Worcestershire and seasoning.

Step 3

Roast for 2 hours. Let cool completely, then slice thinly on a meat slicer.

Step 4

For the au jus: Place red wine in a saucepan over medium-high heat. Reduce by half. Add beef base and dissolve thoroughly. Add onion, garlic, thyme and 6 cups water and simmer until vegetables are soft. Strain.

Step 5

For the French dip: Split and toast hoagie rolls. Heat au jus until hot, then add prime rib to heat thoroughly.

Step 6

Whisk together horseradish and sour cream in a bowl. Spread on hoagie rolls. Layer Swiss cheese in hoagies, then add caramelized onions and top with hot prime rib.

Step 7

Plate sandwiches with fries and cups of warm au jus for dipping.