Prime Rib Sandwich

By damiles1

Ingredients

• 2 tablespoons butter
• Leftover prime rib, sliced thin
• 1 large Vidalia onion, sliced thinly
• 4 sandwich rolls, such as ciabatta or sourdough, split lengthwise and toasted
• 1/4 cup mayonnaise
• 1/4 cup sour cream
• 3 tablespoon prepared horseradish
• 1/4 cup baby arugula leaves

Preparation

Step 1

In a large skillet over medium heat melt the butter.
Add the onions and cook until golden and caramelized, about 15-20 minutes.
In a small bowl, combine the mayonnaise, sour cream, and horseradish.
Spread generously on each side of the rolls.
On one side of the roll layer prime rib slices, caramelized onions, then arugula.
Top with remaining half of roll.