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Transform your leftover prime rib roast into the ultimate prime rib sandwich!
“So good with leftover prime rib! The caramelized onions add the best flavor.”
Melt the butter in the pan and add the onions.
Reduce heat and simmer until onions are caramelized.
Season with sugar, salt and pepper.
Mix the horseradish sauce ingredients in a bowl.
Toast the bread. Then, assemble the sandwiches.
Cut the sandwiches in half and serve with your favorite sides.
Choose a sturdy bread and make sure the flavors are balanced.