Cook quinoa according to package. Typically this involves combining quinoa with broth/water in a saucepan, bring to a boil, reduce heat to low and cover. Cook for 15-20 minutes, until all liquid is absorbed.
In large bowl, combine quinoa, red pepper, mango, cilantro, black beans, and red onion.
To the bowl add the red wine vinegar, olive oil, lime juice, and salt and pepper.
Stir to combine well.
Eat immediately or store in refrigerator in an air-tight container.