"I don't know how many recipes for filete encebollado (beef with onions) I have found in my life. In the end I went ahead and created my own, with guidance from my carnivorous husband...."
INGREDIENTS
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1 1/2 lb beef top round steak, sliced crosswise (1/4"-thick aprox.)
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1 large purple onion cut into thin strips
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1/2 teaspoon of dry oregano leaves, ground
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1//4 teaspoon of freshly-ground pepper
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4 tablespoons of vegetable oil
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1/4 cup of red wine vinegar
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1/2 teaspoon of brown sugar
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Salt