Crunchy celery contrasts with sweet, tender citrus in this lovely salad that perfectly exhibits how a touch of highly flavorful ingredients — balsamic vinegar and feta — can elevate a dish without adding too much in the way of fat or sodium.
Squeeze juice from 1 citrus fruit into a large bowl. Add feta cheese and vinegar and mix with a fork, mashing the cheese to make a dressing. Peel remaining citrus and separate into segments. Transfer to bowl with dressing. Add salad greens, celery leaves, and celery and toss well.