Preheat oven to 350°.
Arrange French bread cubes in a single layer on a baking sheet.
Bake at 350° for 15 minutes or until toasted.
Combine croutons, arugula, fennel, and onion in a large bowl.
Combine water, lemon juice, and salt; stir well.
Drizzle over salad; toss gently to coat.
Spoon salad onto plates; top with Parmesan cheese, and sprinkle with pepper.