- Whisk the olive oil, white balsamic vinegar, and salt together in a small bowl; set aside.
- Combine the arugula, spinach, onions, and tomatoes in a large salad bowl.
- Drizzle the vinaigrette over the salad mixture; toss to coat.
- Add the feta cheese and watermelon to serve.
Prep Time: 10 minutes
Cook Time: 0 minutes
Number of Servings: 4