This stunning salad balances sweet from watermelon with the peppery notes of arugula, salty, briny flavor of feta and umami via tomatoes. They are all tossed together with a balanced rice-vinegar and extra-virgin olive oil dressing.
In blender, puree oil, vinegar and black pepper and salt to taste until blended. In large serving bowl, gently toss remaining ingredients until well combined. Add desired amount of vinaigrette and toss to coat; serve immediately.