Combine the fruits in a bowl. Whisk together the lemon juice, sugar, and coconut milk in a small bowl. Toss the dressing with the fruit and the mint. Taste for sugar and lemon juice and chill until ready to serve, up to 10 hours.
Recipe courtesy Gale Gand, Just A Bite by Gale Gand and Julia Moskin: Clarkson N. Potter Publishers, 2001