I love tom yum soup- it is probably my favorite soup of all time. There's no way I'd skip ordering it when going to a Thai a restaurant, and I always have a jar of tom yum paste on hand to make my own. While the tom yum paste makes great soups and even stir-frys, I was craving something more substantial so I came up with this. The addition of yams and kale really doesn't taste as strange as it sounds, honest. If you can't find lemongrass or kaffir lime leaves, use the zest from the orange & lime. No Thai chili peppers? Jalapenos make a decent, milder substitute.