INGREDIENTS
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Serves 2 to 4
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For the marinade:
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1/2 cup balsamic vinegar
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2 tablespoons Dijon mustard
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2 garlic cloves, peeled and sliced
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1 cup extra-virgin olive oil
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1 teaspoon kosher salt
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Freshly ground black pepper
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1 (2- to 3-pound) flank steak
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For the stuffing:
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3 ounces prosciutto
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6 slices provolone cheese
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1 cup spinach, basil, or arugula
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Kosher salt and pepper
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Neutral cooking oil, such as canola