Prime Rib Sandwich

Ingredients

• 2 tablespoons olive oil
• 2 medium yellow or white onions thinly sliced
• 1 baguette
• ½ cup horseradish sauce Use leftovers from your prime rib dinner or follow the recipe included below
• 1 pound cooked prime rib sliced thinly and fat trimmed
• 2 cups arugula wild rocket in the UK, or any other greens

Horseradish Sauce

• ¼ cup sour cream
• 1 tablespoons prepared horseradish
• 1 tablespoons mayonnaise
• ½ teaspoon apple cider vinegar
• ½ teaspoon Dijon mustard
• ½ tablespoon chopped chives
• ¼ teaspoon salt
• ⅛ ground black pepper

Instructions

1. If you need to make fresh horseradish sauce, combine the sauce ingredients in a small bowl, and set aside.
2. To caramelize the onions, heat olive oil in a pan over medium heat. When the oil is hot, add the onions, cook the onions but keep stirring them (gently) all the time to caramelize them. This takes about 20 minutes.
3. In a pan warm up the prime rib briefly so it does not change color, this step is optional.
4. Take the baguette, remove the ends, and slice into 4 inch pieces. Slice in half lengthwise to open them up.
5. Spread horseradish sauce over each piece of baguette (top and bottom), then add sliced prime rib, followed by caramelized onions, and arugula. Finish off with a sprinkling of ground black pepper and serve.