Hearty Tuna Casserole

• 2 cans tuna style (chunk)
• 1 zucchini (sliced)
• 1 tomato (chopped)
• 160 ml sour cream
• 120 gr monterey jack cheese (shredded)
• 120 ml mayonnaise
• 50 gr celery (chopped)
• 40 gr egg noodles (uncooked)
• 40 gr green onion (sliced)
• 10 ml mustard