01 - Heat 1/2 cup water and 1/4 cup sugar in a small saucepan over medium heat, stirring constantly until sugar completely dissolves. Remove from heat and allow to cool to room temperature.
02 - Combine diced mango, halved strawberries, and freshly squeezed lemon juice in a blender. Process on high speed until completely smooth and no fruit chunks remain.
03 - Pour the fruit puree through a fine mesh sieve into a large pitcher, using a spatula to press through as much liquid as possible. Discard the remaining pulp for a smoother consistency.
04 - Add the cooled simple syrup and 3 cups cold water to the strained fruit puree in the pitcher. Stir thoroughly until all components are fully incorporated.
05 - Taste the lemonade and adjust sweetness by adding more simple syrup if needed, or dilute with additional water for a lighter flavor profile.
06 - Fill glasses with ice cubes, pour lemonade over ice, and garnish with fresh mint leaves, strawberry slices, mango pieces, and lemon wheels. Serve immediately while cold.