Making—and eating—mu-shu pork means using your hands. Spoon or brush the sauce onto the pancake before filling and folding it.
If you've never had mu-shu pork, imagine a delicious pork stir-fry that, instead of being served with rice, gets wrapped in a tender, chewy pancake, tortilla style. This famous dish is from northern China where rice is seldom used; instead, flour-based noodles, steamed buns, and pancakes like these are served. The thin pancakes, called Mandarin pancakes, are the same as those featured in Peking duck. Indeed, mu-shu pork is known in China as the poor man's Peking duck, in part because very little meat is required, and in part because the duck takes at least a day to make, while the pork filling for mu-shu is ready in minutes.
While you can find mu-shu pork on many Chinese restaurant menus, it's a wonderful dish to make at home because of the pancakes. Unfortunately, the pancakes served at most restaurants are often commercially made and they feel (and taste) like paper. They're very dry and—I'm sure this has happened to many of you—they often tear, causing the filling to fall out. Fresh homemade pancakes, on the other hand, are supple and slightly chewy; they surround the filling willingly, almost lovingly. Compared to the starch-white color of commercially made pancakes, they have a lovely golden color plus a little browning from the skillet, which adds just a bit of toasty flavor.