Using a sharp knife, slice the watermelon into thin, even rounds approximately 1/4 inch thick. Arrange the slices on a large serving plate to prepare for layering.
Peel and finely chop the mint leaves, then sprinkle them over the watermelon slices to add fresh aroma and flavor.
Zest the lime directly over the assembled watermelon slices, then cut the lime and squeeze fresh juice over the top to add brightness.
Optional: Lightly sprinkle sea salt over the slices to enhance sweetness and balance acidity.
Stack or overlap the watermelon slices to create a layered, cake-like appearance. Garnish the top with additional mint leaves and a final squeeze of lime for presentation.
Serve immediately to enjoy the crisp texture and refreshing flavors or refrigerate briefly to chill before serving.