At only 65 calories per serving, this appetizer will win over starch fans, too.
In a large bowl, whisk together lemon juice, oil and sugar; season with salt and pepper. Arrange roast beef on a work surface. Add arugula to dressing; toss. Divide arugula among centers of roast beef slices, with a few leaves extending beyond beef. Top with shaved cheese, roll into cylinders and serve.