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Rinse chicken breasts and pat dry.
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Flatten chicken to 1/2-inch thickness and pierce with a fork several times.
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Rub with black pepper and place in a large ziploc baggie.
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Add garlic, onions, lime juice, and tequila to the ziploc baggie and seal.
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Rub liquid around to coat chicken and place in a shallow baking dish and refrigerate up to 12 hours.
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Every couple of hours rub the marinade around and turn the baggie over.
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Heat olive oil in a large skillet over medium-high heat.
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Add chicken and discard marinade.
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Turn heat down to medium and slowly cook chicken until no longer pink.
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Once chicken is done squirt with additional lime juice and cut up to serve in tortillas, or serve whole.