Roast Beef, Broccoli Rabe, and Provolone Sandwiches

Ingredients:

• 8 ounces broccoli rabe, stem ends removed
• 1 tablespoon extra-virgin olive oil
• 4 garlic cloves, divided
• 1/4 teaspoon freshly ground black pepper
• 1/8 teaspoon kosher salt
• 8 (1-ounce) slices rustic whole-grain bread
• 8 ounces thinly sliced low-sodium roast beef (such as Boar's Head)
• 3 ounces thinly sliced provolone cheese

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