Ingredients
Equipment
Method
- If your prime rib is cold from the refrigerator, gently warm it in a skillet over medium-low heat for a few minutes until just heated through. Be careful not to overcook it, as it will be cooked again in the sandwich. Alternatively, you can skip this step if your prime rib is at room temperature or if you prefer a cooler filling.1 pound cooked prime rib
- In a medium bowl, combine the shredded Gruyère cheese and the shredded sharp white cheddar cheese. Add the finely chopped red onion and the chopped fresh parsley to the cheese mixture. Toss gently to distribute the onions and parsley evenly throughout the cheese.1 cup shredded Gruyère cheese, 1 cup shredded sharp white cheddar cheese, 1/4 cup red onion, 2 tablespoons fresh parsley
- Lay out four slices of your chosen bread on a clean work surface. Spread a thin layer of Dijon mustard on the inside of each of these four slices.8 slices sturdy bread, 1 tablespoon Dijon mustard
- Generously pile the warmed or room-temperature prime rib slices onto the mustard-spread bread slices. Be sure to distribute the meat evenly. Next, spoon a substantial amount of the cheese, red onion, and parsley mixture over the prime rib, covering it completely.1 pound cooked prime rib, 1/4 cup red onion
- Spread a thin layer of mayonnaise on the inside of the remaining four slices of bread. This mayo layer will be against the filling. Carefully place these mayo-spread slices on top of the cheese-covered prime rib to complete the sandwiches.8 slices sturdy bread, 1/4 cup mayonnaise
- Spread the softened unsalted butter evenly over the outside of all eight bread slices. This is what will create that perfect golden-brown, crispy crust when grilling.4 tablespoons unsalted butter, 8 slices sturdy bread
- Heat a large skillet or griddle over medium heat. Place 2-3 assembled sandwiches into the hot skillet, butter-side down. Grill for 3-5 minutes per side, or until the bread is golden brown and toasted, and the cheese is completely melted and gooey. You may need to adjust the heat slightly to prevent burning while ensuring the cheese melts thoroughly.4 tablespoons unsalted butter, 8 slices sturdy bread
- Once perfectly grilled, carefully remove the Holiday Prime Rib Grilled Cheese sandwiches from the skillet. Slice them in half, if desired, and serve immediately while the cheese is wonderfully stretchy and the prime rib is warm and flavorful.
Notes
Properly storing and reheating your Holiday Prime Rib Grilled Cheese will ensure you can enjoy its deliciousness multiple times. Leftovers can be stored in an airtight container in the refrigerator for up to 3 days. To reheat, the best method is actually to assemble the sandwich again, but without grilling it fully. Place your assembled, but un-grilled, sandwich in a skillet over medium-low heat with a little extra butter. Grill slowly on each side until the bread is golden brown and the cheese is completely melted. This method helps to revive the crispiness of the bread and the gooeyness of the cheese, much like the original preparation. Freezing this particular sandwich is not ideal as the bread can become soggy upon thawing and reheating.