Beef Shank Soup

• 4 peppercorns (whole)
• 4 in slow-cooking pot (square)
• 1 onion (chopped)
• 1 carrot (chopped)
• 1 bay leaf
• 1 clove garlic in (cut)
• 1,900 ml water
• 450 gr beef shanks
• 50 gr celery (chopped)
• 12 gr thyme (dried)