Tuna Cakes With Dill Tartar Sauce

• 1 egg (white)
• 1 togurt (plain)
• 90 gr onion (chopped)
• 80 gr breadcrumbs
• 75 gr celery (chopped)
• 30 ml mayonnaise
• 30 ml cream cheese
• 10 ml lemon juice
• 7 gr onion (chopped)
• 7 gr cucumber (chopped)