Leftover Prime Rib Sandwich

This Leftover Prime Rib Sandwich is loaded with prime rib and topped with warm caramelized onions and mushrooms. It's a delicious way to make use of the prime rib leftovers.

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WHAT INGREDIENTS DO I NEED TO MAKE PRIME RIB SANDWICH?

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– Thin slices of leftover prime rib – Sweet caramelized onions and mushrooms – French bread – Creamy horseradish sauce – Arugula – Au jus

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Melt 2 tablespoons of butter in a large skillet. When the butter is melted, add the sliced onions and mushrooms to the pan.

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Sauté the onions and mushrooms over high heat for 3-5 minutes without stirring. Turn the mushrooms and onions over and let it cook for 5-7 more minutes, stirring constantly.

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While the mushrooms and onions are cooking, trim the leftover prime rib. Remove the bone and extra fat from the edges of the meat.

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