In a saucepan, combine the rinsed quinoa and water or vegetable broth. Bring to a boil over medium-high heat, then reduce to low, cover, and simmer for 15-20 minutes, or until all the liquid is absorbed. Remove from heat and let it cool.
In a large mixing bowl, combine the diced mango, black beans, red bell pepper, red onion, corn, and fresh cilantro.
In a small bowl, whisk together the lime juice, olive oil, cumin, salt, and pepper to create a dressing.
Once the quinoa has cooled, fluff it with a fork and add it to the mixing bowl with the vegetables and beans.
Pour the dressing over the quinoa mixture, tossing gently to combine until everything is well coated.
Taste and adjust seasoning, adding more salt, pepper, or lime juice as desired.
Chill in the refrigerator for at least 30 minutes to allow the flavors to meld together before serving.
Notes
Serve the salad in a large, colorful bowl garnished with additional cilantro and lime wedges for a refreshing finish.