Cornbread

• 2 eggs whites
• 1 onion
• 900 gr beef (ground)
• 220 gr cornbread crumbs (fresh)
• 130 gr zucchini
• 80 ml tomato sauce
• 55 gr packaged bread crumbs
• 20 gr parsley leaves
• 16 ml vegetable oil
• 3 gr salt