In a mixing bowl, gently combine the strawberries, raspberries, and mandarin orange slices using a spoon.
In another bowl, whisk together the water, lemon juice, mint extract, vanilla syrup, and strawberry glaze until fully blended.
Drizzle the dressing over the fruit mixture and stir gently to ensure the fruit is evenly coated.
Cover the bowl and refrigerate for 1 hour to marinate the fruit in the dressing, enhancing the flavors.
Before serving, garnish with mint leaves and a sprinkle of sugar for added sweetness and presentation.