Combine the black beans, corn, cucumber, cilantro, and green onion in a large bowl; mix well. You may wish to add more lime to taste.
Add the lime juice, Blackberry Roasted Pepper Vinegar in a small bowl. Season with salt, pepper and cumin. Mix well. Drizzle the olive oil to emulsify the dressing. Taste adjust with seasoning, lime juice, or vinegar.
and feta i
Toss the dressing with the bean salad, add the feta, and chill for at least one hour before serving.