"“No restaurant could rival Grandma's incredible steak sandwiches.”..."
INGREDIENTS
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2 pounds beef flank steak
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1 (10 1/2-ounce) can French onion soup
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2 tablespoons red-wine vinegar
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1 tablespoon olive oil
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1 clove garlic, minced
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1/4 teaspoon black pepper
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1 medium red onion, cut into 1/4-inch-thick slices
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6 crusty Italian rolls, split