Combine quinoa and broth in a medium, heavy bottom pan. Bring to a boil, then cover pan and reduce heat to low. Cook until water is absorbed and quinoa is tender (about 13 to 15 minutes). Set aside to cool to room temperature.
Once quinoa has cooled, transfer it to a large bowl. Add the tomatoes, feta, garbanzo beans, watermelon, and basil to the quinoa. Toss gently to combine.
In a small bowl, whisk together lemon juice, olive oil, salt, and pepper.
Pour lemon vinaigrette over the quinoa mixture and toss to coat.
Taste salad, then season with additional salt and pepper, if necessary.
Serve immediately. Enjoy!
Notes
This salad serves four people as a main dish, however you can also serve it as a side side.