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Meanwhile, heat 10-inch nonstick skillet over medium-high heat. Add chorizo; cook 4 to 5 minutes, stirring occasionally, until meat starts to brown. Drain on paper towels. Reduce heat to medium. Add onion; cook 5 minutes, stirring occasionally. Stir in vinegar; cook 5 minutes longer or until onion is soft and caramelized. Remove from heat.