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For Carne Asada:
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Combine Coca-Cola, sliced onion, salt, pepper and ground cumin in a plastic storage bag. Place in flank steak, seal and turn to coat. Place bag on baking sheet or glass dish. Place in fridge to marinate for at least one hour.
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Preheat grill – remove flank steak from plastic bag, grill steak for 4-5 minutes on each side. Place the flank steak on a cutting board, tent with foil and allow to rest for 10 minutes.
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Dice flank steak, pile on warm hamburger buns and top with cucumber salsa.
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For Cucumber Salsa:
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Combine all ingredients in a bowl, stir to combine. Taste and adjust with salt and pepper. Place in fridge until ready to serve.