Flank Steak Hoagies

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Rolls:

3 hoagie rolls

3 tablespoons olive oil 

1 clove garlic, smashed and peeled 

Filling:

One 1 1/2-pound flank steak, at room temperature 45 minutes

1 1/2 teaspoons kosher salt

1 red onion, sliced 1/3-inch-thick 

1 teaspoon plus 2 tablespoons olive oil

1 cup pitted kalamata olives, chopped 

1/2 cup chopped fresh basil 

1/2 cup marinated sun-dried tomatoes, drained and chopped 

2 tablespoons capers, drained and chopped 

1 tablespoon freshly squeezed lemon juice 

1/2 teaspoon anchovy paste 

1/4 teaspoon dried oregano 

2 jarred roasted red bell peppers, sliced 

6 thin slices provolone

3 cups loosely packed baby arugula