We enjoyed this meal last night. It was very tasty. The combination of sweet potato with kale was surprisingly delicious.
I did not follow the instructions exactly. First the sweet potatoes were lightly steamed, so that it was not necessary to cook them so long in the frying pan, thus the kale would not be overcooked. We found the recipe at epicurious.com and will make the recipe again. Next time we would prefer to bake the mustard crusted tofu rather than frying and use another marinade, as this one seemed a bit oily.