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 spoon to press the mixture through and extract maximum liquid. Discard remaining pulp or reserve for another use.
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 add more sweetener or water as needed to achieve your preferred balance of sweetness and tartness. Stir well after each adjustment.
06 - Fill glasses with ice cubes, pour lemonade over ice, and garnish with fresh mint leaves, fruit slices, and lemon wheels. Serve immediately while chilled.