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6
Easy
Pot Roasted is a poor translation to explain the Puerto Rican caldero which is a large, heavy round, or oval cast-iron or aluminium casserole used widely in this island. Enamelled cast-iron is probably the best substitute, but the pot must be a heavy one.
Mix together 6 tablespoons of olive oil, the vinegar, garlic, salt, a generous amount of freshly ground pepper, and one of the onions. Rub this into the fillet of beef and let it marinate over-night in the refrigerator. Take out the beef and pat dry with paper towels. Discard the marinade. Heat the other 3 tablespoons of oil in the caldero and brown the beef all over. Add the remaining 2 onions