Lamb Shanks Stockpot

WHAT YOU'LL NEED

• 4 lamb shanks
• 1 Knorr Lamb Stock Cube dissolved in 1.5 litres boiling water
• 3 tablespoons tomato puree
• 30 ml reduced salt dark soy sauce
• 5 sprigs rosemary plus a little for decoration
• 4 small onions peeled and left whole
• 8 medium sized carrots cut into chunks
• 1 small swede cut into chunks
• 4 medium sized potatoes cut in half