You can make a vegetarian version of Thai coconut soup by simply substituting chicken stock with vegetable stock and skipping chicken.   This recipe already has mushrooms and carrots, so it becomes a vegetarian coconut soup. Feel free to add green beans, zucchini, or other color peppers.   You can also make a shrimp version of this. Just replace chicken with shrimp, and it will be the same creamy texture with shrimp in it, and this is called tom kha goong.