Bring a large saucepan of water to boil over high heat. Add orzo and 1 tb salt and boil for about 8 minutes,or until pasta is tender but still slightly firm. Turn orzo into a sieve, rinse under cold water to stop cooking, and drain well.
Dressing: In a small bowl, combine vinegar and mustard, then whisk in oil.
Bring small saucepan of water to boil over high heat, add carrots, and blanch for 2 minutes. Drain in a colander.
In a large bowl, combine orzo, carrots, tomato, green pepper, celery, onion and parsley. Add dressing, season with salt and pepper, and toss to combine well. Serve with endive and radicchio.