INGREDIENTS
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1 1/2 cups balsamic vinegar
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2 tablespoons canola oil
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1 small onion, coarsely chopped
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1 large clove garlic, coarsely chopped
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1/2 cup ketchup
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1 tablespoon ancho chile powder
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1 1/2 teaspoons paprika
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2 teaspoons dijon mustard
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1 1/2 teaspoons red wine vinegar
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1 1/2 teaspoons Worcestershire sauce
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1 small chipotle chile in adobo sauce, chopped
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1 1/2 teaspoons packed dark brown sugar
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2 teaspoons honey
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2 teaspoons molasses
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Kosher salt and freshly ground pepper
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2 pounds flank steak
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1 French baguette, halved lengthwise and cut into 4-inch pieces
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Extra-virgin olive oil
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Kosher salt and freshly ground pepper
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1 cup grated monterey jack cheese
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Sliced scallions, for serving