Cook quinoa:
Wash the quinoa, then prepare it per the package instructions.Make dressing:
While the quinoa cooks, prepare the dressing: In a small bowl, mix lime zest, lime juice, red wine vinegar, cumin, minced garlic, and salt with a whisk until well blended. Set aside.Chop vegetables:
Rinse and drain the black beans. Cut the tomatoes and bell pepper into small dice. Slice the green onions and chop the cilantro. Combine these in a large bowl with the sweet corn.Combine salad:
Add the cooked quinoa to the bowl. Re-whisk the dressing, then pour it over the salad and mix thoroughly. Adjust seasoning if needed (extra salt, lime juice, vinegar, etc.).Serve or chill:
Serve right away or refrigerate for a few hours to allow flavors to meld. Garnish with avocado and a squeeze of fresh lime if desired.