Shiitake Asparagus Stir Fry Tofu

Adapted from this recipe: http://www.tablespoon.com/recipes/shiitake-asparagus-stir-fry-tofu-recipe/1/
Added red pepper and bok choy.

Thoughts - might be better over a grain or rice rather than pasta. Bean sprouts, green beans or sugar peas would be great in this too. Sauce is missing something, sesame seeds would be nice to add.