Combine black-eyed peas, corn, chopped roasted red pepper, cucumber, mango, red onion and half of the cilantro in a large bowl.
Combine fresh lime zest and juice, vinegar, sugar, salt and pepper in a small bowl. Stir well to dissolved sugar. Pour over black-eyed pea mixture and stir well. Taste and add more sugar and/or salt, if needed.
Refrigerate for 2-3 hours then garnish with remaining cilantro just before serving.
Store any leftovers in an airtight storage container in the refrigerator.