Beer Cheese Soup

• 1 parsley (chopped fresh)
• 1,900 ml chicken broth
• 350 ml beer preferably flat
• 230 gr butter
• 230 gr cheddar cheese (shredded)
• 130 gr carrots (finely chopped)
• 130 gr all purpose flour
• 120 gr onion (finely chopped)
• 100 gr celery (finely chopped)
• 16 gr parmesan cheese (freshly grated)