Drain and rinse the black beans thoroughly under cold water, then place them in a large mixing bowl.
Finely chop the red onion and bell pepper, then add them to the bowl with the beans. The vibrant colors and aroma of fresh vegetables will start to fill the air.
Use a lime squeezer to extract about 2 tablespoons of fresh lime juice, then pour it over the beans and vegetables. The citrus will immediately brighten the mixture and release a fresh, tangy scent.
Drizzle in about 1 tablespoon of good quality olive oil and sprinkle in a pinch of cumin for smokiness. Toss gently to coat all ingredients evenly, ensuring the veggies are coated in the dressing.
Season with salt and freshly ground pepper, then toss again to distribute the seasoning throughout the salad. The mixture should look vibrant, with the beans slightly marinated and the vegetables still crisp.
Cover the bowl with plastic wrap and refrigerate for at least 30 minutes to allow the flavors to meld and the raw onion to mellow out.
Before serving, give the salad a gentle toss, taste for seasoning, and adjust lime or salt if needed. Sprinkle chopped cilantro or parsley on top for a fresh herbal finish.
Serve chilled as a refreshing side dish or a light main, perfect for hot days or casual gatherings.