Hamburger & Barley Soup

• 1 onion
• 3/8 barley
• 950 ml beef broth
• 450 gr beef preferable (ground lean)
• 230 gr tomatoes
• 140 gr garlic
• 130 gr carrots
• 100 gr celery (diced)
• 90 gr cabbage
• 7 ml balsamic vinegar