Assemble: In large bowl, gently combine watermelon, arugula, feta, red onion, mint, and basil. Whisk together remaining olive oil, balsamic, mustard, salt, and pepper. Gently combine with the rest of the salad. Serve warm or chilled.

Assemble: In large bowl, gently combine watermelon, arugula, feta, red onion, mint, and basil. Whisk together remaining olive oil, balsamic, mustard, salt, and pepper. Gently combine with the rest of the salad. Serve warm or chilled.