In a small bowl, whisk together the lime juice, lime zest, and honey until fully dissolved. Set aside.

Trim both ends of the watermelon, slice it in half lengthwise, and cut each half into 1-inch thick triangles.

Preheat your grill to high temperature (400-450°F).

Brush both sides of watermelon triangles with the honey-lime mixture and grill for 2-3 minutes on each side.

Remove from grill, drizzle remaining honey-lime mixture, and sprinkle cilantro before serving.