INGREDIENTS
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Marinade:
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1/4 cup red wine vinegar (paleo diet: red wine ok)
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2 Tbsp. olive oil
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2 tsp. salt (paleo diet: sea salt)
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2 tsp. oregano
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1 Tbsp. cumin
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2 garlic cloves minced
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2 lbs. flank steak
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2 medium onions thinly sliced
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1/2 cup chicken stock
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2 Tbsp. olive oil