1 part melon liqueur (recommended: Midori or generic brand)
Various melon balls (cantaloupe, honeydew, or watermelon - using all 3 is called "Triple-Lindy" and is definitely money)
This drink can be served straight up or on the rocks.
If making straight up: To a cocktail shaker, add ice, vodka, melon liqueur, and a splash orange juice; shake vigorously to combine. Strain into a large, chilled martini glass and garnish with melon balls.
If making drink on the rocks: Fill rocks glass with ice. Add vodka, melon liqueur and enough orange juice to fill glass. Stir with either a stirrer or straw. Garnish with melon balls.