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Ingredients

• 6 cloves  garlic, peeled
• 3 sprigs   rosemary (3 to 4 inches each)
• 1 tablespoon  extra-virgin olive oil
•   Several pinches kosher salt
• 1/4 cup  mayonnaise
• 1 teaspoon  Dijon mustard
• 4   sandwich rolls, such as Kaiser or club rolls
• 12 ounces  thinly sliced leftover Slow-Roasted Prime Rib; about 2 cups
• 2 cups  sliced onion, sauteed
• 2 cups  sliced mushrooms, sauteed

Description

The Sandwich Is Better If The Beef Isn't Refrigerator-cold, So Either Let The Sliced Beef Warm At Room Temperature For About 15 Minutes, Or Warm The Sandwiches In The Residual Heat From The Broiler After You've Toasted The Rolls.

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