In a small bowl, combine orange juice, vinegar, and sugar. Stir until blended and set aside.
Place cucumber, blueberries, strawberries, and apple in a large bowl. Top with the orange juice mixture and stir gently to coat.
Cover and refrigerate for at least 1 hour (overnight is best). Stir gently just before serving. Garnish with mint, if using. Enjoy!!!
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