Tom Yum Kung Hot and Sour Shrimp Soup Bring the stock to a boil over medium heat. Add the garlic, lime leaves, galangal, fish sauce, lemon grass, and shallots, then the mushrooms and chilli peppers, if using. Simmer for minutes. Add the shrimp and reheat to boiling. Cook until the shrimps are pink, opaque, and firm but no longer than minute