Prep the Fruit: Place your stable, cold watermelon on a cutting board. Cut into 1-inch thick slabs, then slice into 24 uniform square cubes. Pat the top surface dry with a paper towel.
Cut the Cheese: Carefully cut the block feta into 24 squares that perfectly match the top dimension of your watermelon cubes, aiming for about 1/4 to 1/2-inch thickness.
Whisk the Glaze: In a small bowl, thoroughly mix the hot honey, balsamic glaze, and extra virgin olive oil until smooth and glossy.
Foundation Layer: Pour a generous portion of the glaze onto your wooden serving platter, allowing it to pool elegantly. Arrange the watermelon cubes cleanly on top of the glaze.
Stack the Layers: Place one square of block feta directly on top of each prepared watermelon cube.
Garnish and Secure: Generously coat the top surface of the feta blocks with the finely chopped pistachios, letting them spill down the sides. Press a fresh mint leaf into the center of each cube, then push a wooden cocktail pick straight through the stack to secure. Serve immediately while chilled.