Start by cutting your watermelon into thick, flat slabs, about one inch thick. Remove the rind from each slab so you're left with a clean, flat surface of fruit. This makes it much easier to press your cookie cutter through cleanly.
Press your star-shaped cookie cutter firmly into each watermelon slab. Wiggle it gently to release the star shape without tearing the fruit. Repeat this across all your slabs until you've used up most of the watermelon.
Lay your watermelon stars on a paper towel-lined tray for a few minutes. This step pulls away extra juice so the stars hold their shape better. It also keeps your serving platter from turning into a puddle.
Drizzle the fresh lemon juice lightly over the watermelon stars. If you're using honey, drizzle that on now too. This adds a subtle flavor lift without overpowering the watermelon's natural sweetness.
Scatter chopped fresh mint over the top for a pop of color and fragrance. Place the tray in the refrigerator for at least 10 minutes before serving. Chilling makes the bites extra refreshing on a hot day.
Arrange the chilled stars on your serving platter however you like. Add toothpicks if you want an easy, mess-free way for kids to grab them. Serve immediately for the best texture and flavor.