This is a great salad. With the watermelon the kids will like it also.
Whisk together the olive oil, vinegar, and salt in a large mixing bowl. Add the tomatoes, arugula, and onions; toss to coat. Gently stir in the watermelon and feta cheese to serve.
Per Serving: 131 calories; protein 3.3g; carbohydrates 12.4g; fat 8.4g; cholesterol 12.6mg; sodium 284.3mg.