"A pretty simple recipe, quick and easy to prepare, salsa criolla is the perfect accompaniment to many dishes. The lime juice is what makes this onion salsa/relish special. It adds a bright flavor that sweetens the onions and livens up everything else on the plate. Great summer dish! Store in the refrigerator for up to 2 days."
Fill a bowl with water; stir in salt until dissolved. Add red onions; let soak for 10 minutes. Drain and pat dry.
Mix onions, cucumbers, tomato, rice vinegar, lime juice, white wine vinegar, jalapeno pepper, cilantro, olive, and black pepper together in a large bowl. Cover with plastic wrap and let marinate at room temperature before serving, about 30 minutes.