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 - Place watermelon slices on the hot grill. Cook for 2-3 minutes per side until distinct 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 and smooth.
05 - In a large salad bowl, combine arugula or baby greens, grilled watermelon pieces, cherry tomatoes, and sliced red onion.
06 - Drizzle the balsamic dressing evenly over the salad. Gently toss with tongs to coat all ingredients without damaging the watermelon.
07 - Top with crumbled feta cheese, fresh mint leaves, and toasted seeds or nuts if desired. Serve immediately while the watermelon is still slightly warm.