Combine Ingredients: In a large mixing bowl, combine the sliced cucumber, red onion, organic sugar, apple cider vinegar, water, and chopped cilantro. Stir well to ensure everything is evenly coated.
Chill in Refrigerator: Cover the bowl with plastic wrap or a lid and let the mixture chill in the refrigerator for at least 1 hour. This allows the flavors to develop and the salad to crisp up.
Season to Taste: After chilling, taste the salad and add salt as needed to enhance the flavors.