Ingredients
2 tablespoons butter for caramelizing the onions
2 large thinly sliced yellow onions to add sweetness and depth
2 tablespoons mayonnaise as the base for the spread
1 teaspoon creamy horseradish for a tangy kick in the spread
16 cloves roasted garlic to mix into the spread for extra flavor
2 cups arugula dressed for a fresh, slightly bitter crunch
1 teaspoon olive oil to dress the arugula
1 teaspoon white balsamic vinegar or lemon juice for a light acidity in the arugula dressing
8 slices sourdough or large baguette as the sturdy bread base
12 ounces thinly sliced prime rib the tender, flavorful protein centerpiece
Instructions
1-Start by slicing your leftover prime rib thinly to keep its tender texture without reheating, which could make it tough.
2-First, gather all ingredients and set up your workspace. Thinly slice the 12 ounces of prime rib and caramelize the 2 large thinly sliced yellow onions in 2 tablespoons of butter over medium-high heat. Cook them gradually with minimal stirring until they turn a dark caramel color, which takes about 15 minutes total prep time.
3-Next, prepare the spread by combining 2 tablespoons of mayonnaise with 1 teaspoon of creamy horseradish and mixing in the 16 cloves of roasted garlic, either whole or mashed. For the arugula, toss 2 cups with 1 teaspoon of olive oil and 1 teaspoon of white balsamic vinegar or lemon juice, then season with salt and pepper.
4-Once everything is ready, assemble by spreading the horseradish mayo on 8 slices of sourdough or baguette. Layer the dressed arugula, prime rib slices, and caramelized onions on top. The sandwich is served cold, allowing flavors to meld without extra cooking.
5-Slice the prime rib thinly for tenderness.
6-Cook onions slowly for that perfect caramelization.
7-Mix the spread to add depth of flavor.
8-Toss arugula for a fresh contrast.
9-Layer ingredients evenly on the bread.
Last Step:
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🔪 Slice the prime rib thinly while it’s still cold for the best texture and to prevent the meat from falling apart
🧅 Caramelize onions slowly with minimal stirring to develop deep, sweet flavor that balances the rich meat
🌿 Fresh arugula adds a peppery crunch that cuts through the richness and provides a fresh contrast to the savory ingredients
- Prep Time: 5 minutes
- Cook Time: 15 minutes
- Category: Sandwich
- Method: Stovetop
- Cuisine: American
- Diet: Non-Vegetarian
Nutrition
- Serving Size: 1 sandwich
- Calories: 783
- Sugar: 7
- Sodium: 802
- Fat: 37
- Saturated Fat: 14
- Unsaturated Fat: 23
- Trans Fat: 0
- Carbohydrates: 83
- Fiber: 4
- Protein: 28
- Cholesterol: 69