INGREDIENTS
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1 cup olive oil
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3/4 cup soy sauce
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1/2 cup balsamic vinegar
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1/3 cup fresh lemon juice
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2 tablespoons stone ground mustard (the kind with whole mustard seeds, I use Grey Poupon)
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6 garlic cloves
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1 teaspoon ground black pepper
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1/4 cup Worcestershire sauce
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1/4 tablespoon onion powder
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3 pounds flank steak