01 - Preheat your grill to medium-high heat. Lightly oil the grates to prevent sticking.
02 - Cut the watermelon into rounds or wedges approximately 1-inch thick. Pat dry with paper towels to remove excess moisture.
03 - Grill watermelon slices for 2-3 minutes per side until distinct grill marks appear while maintaining firm texture. 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 the balsamic dressing over the salad and toss gently to coat all ingredients evenly.
07 - Top with crumbled feta, fresh mint, and toasted seeds or nuts if desired. Serve immediately while watermelon retains slight warmth.