1. To make honey vinaigrette, whisk ingredients together in mixing bowl and refrigerate until ready to use. 2. To make the pickled red onion, whisk together vinegar, tarragon, salt, pepper, and sugar until combined. Add sliced onions and allow to “pickle†for 2 hours in the refrigerator. 3. Assemble salad by tossing together baby greens, arugula, watermelon cubes, pickled red onions, and mint with honey vinaigrette. Mound on a plate and top with feta cheese crumbles and fresh parsley.