Prepare the following, adding each to the same large bowl as you complete it: Halve 1 small honeydew and scrape out the seeds with a spoon. Cut the peel away from each half, then cut the flesh into 1-inch pieces. Halve 1 cup green seedless grapes. Thinly slice 2 star fruits crosswise. Halve, pit, peel, and dice 1 medium avocado. Pick 1/4 cup fresh mint leaves and tear into bite-sized pieces. Gently toss to combine.