Peel and chop the dragon fruit into small pieces, then place it in a blender along with the mango juice. Blend at high speed for about 30 seconds or until smooth. Optionally strain through a fine mesh sieve for a smoother texture.

Pour the smooth puree into a large pitcher. Add the freshly squeezed lemon juice and cold water, and stir thoroughly.

Taste the lemonade and gradually add your sweetener of choice, stirring well and tasting after each addition.

Chill in the refrigerator for about 30 minutes or serve immediately over ice. Garnish with small pieces of fresh dragon fruit or a sprig of mint.