Ham & Rice Balls

• 14 diavolo
• 1 celery rib
• 1 onion
• 1 egg
• 220 gr ham (cooked)
• 120 gr long rice (grain)
• 90 gr fontina cheese
• 65 gr peas (frozen)
• 55 gr bread crumbs (dried)
• 10 gr parmesan