Rinse quinoa under cold water for about 2 minutes.
In a saucepan, combine rinsed quinoa with 4 cups of water and a pinch of salt, bringing it to a boil.
Reduce heat, cover, and simmer for about 15 minutes until water is absorbed.
While the quinoa cooks, prepare your veggies: halve the cherry tomatoes, dice the cucumber, and slice the avocado.
In a large bowl, combine cooked quinoa, black beans, tomatoes, cucumber, and cilantro.
Drizzle with olive oil and lime juice, then season with salt and pepper to taste.
Gently fold in sliced avocado right before serving to maintain its texture.