01 - Preheat your grill to medium-high heat. Lightly oil the grates to prevent sticking.
02 - Cut the watermelon into rounds or wedges about 1-inch thick. Pat dry with paper towels to remove excess moisture.
03 - Place watermelon slices on the grill and cook for 2-3 minutes per side until grill marks appear but the fruit remains firm. Remove and let cool slightly, then cut into cubes or triangles.
04 - In a small bowl, whisk together olive oil, balsamic glaze, Dijon mustard, honey (if using), salt, and pepper until emulsified.
05 - In a large salad bowl, combine arugula or baby greens, grilled watermelon cubes, cherry tomatoes, and red onion.
06 - Drizzle with the balsamic dressing and gently toss to coat all ingredients evenly.
07 - Top with crumbled feta, fresh mint, and toasted seeds or nuts if desired. Serve immediately while the watermelon is still slightly warm.