Add sugar and lemon to melon or watermelon juice, to correct flavor. Add liqueur.
Pour mixture into shallow hotel pans to a depth of approximately 1/4-inch. Place in freezer. (If you pour any deeper, ice crystals will not form properly).
When you see a layer of ice on the surface, scrape to break it up and put pan back in freezer. Continue this process until completely frozen. Final product should look like sequins.