The secret to creating a really yummy tom yum soup is having a rich stock broth made from seafood, the one-of-a-kind taste of kefir lime leaves and plenty of limes You can add more shrimp heads to get a richer broth and cook it for a longer time to extract all that sweet nutrients from the prawns. This soup combines sweet, sour, bitter and salty flavors all in one, and makes our mouth water just thinking of it. No thai dinner is complete without this much appreciated dish