Grilled Steak Sandwich

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Marinade:

6 large garlic cloves, smashed

1/4 cup canola oil

2 tablespoons balsamic vinegar

2 tablespoons Worcestershire sauce

1 tablespoon soy sauce

2 teaspoons honey

1 teaspoon kosher salt

1/2 teaspoon freshly ground black pepper

1 1/2 pound top-round London broil

Provolone Sauce:

2 tablespoons butter

2 tablespoons all-purpose flour

1 cup whole milk

1 cup grated aged Provolone

Kosher salt and freshly ground black pepper

1 bunch green onions, cleaned well

2 tablespoons olive oil

Salt and freshly ground black pepper

5 (6-inch long) French roll baguettes, halved lengthwise