01 - If using sugar, prepare a simple syrup by heating 1/2 cup water and 1/4 cup sugar in a small saucepan over medium heat until sugar dissolves. Let cool.
02 - In a blender, combine mango, strawberries, and lemon juice. Blend until smooth.
03 - Strain the fruit puree through a fine mesh sieve into a pitcher for a smoother lemonade (optional).
04 - Add the simple syrup (or sweetener of choice) and 3 cups cold water to the pitcher. Stir well.
05 - Taste and adjust sweetness or water for your preferred flavor balance.
06 - Add ice cubes, stir, and garnish with fresh mint and fruit slices if desired. Serve immediately for a chilled, refreshing treat.