In a medium saucepan, bring the vegetable broth (or water) to a boil.
Add the rinsed quinoa to the boiling broth, reduce the heat to low, cover, and let simmer for about 15 minutes, or until the quinoa is fluffy and all the liquid is absorbed.
Remove the quinoa from heat and let it cool for about 10 minutes. Fluff with a fork.
In a large mixing bowl, combine the cooled quinoa, cherry tomatoes, cucumber, red bell pepper, black beans, avocado, cilantro, and red onion.
In a separate small bowl, whisk together the lime juice, olive oil, cumin, salt, and pepper until well combined.
Drizzle the dressing over the quinoa mixture and toss gently to combine, ensuring all ingredients are evenly coated.
Taste and adjust seasoning, adding more lime juice, salt, or pepper as desired.
Notes
Serve the salad in a large bowl garnished with extra cilantro and lime wedges on the side for a burst of color and flavor.