Here's how to make suan la tudou si (酸辣土豆丝), a really delicious home-style comfort dish that can be found in almost any restaurant in China. You basically thinly slice potatoes and then toss them in a hot wok with oil, Chinese vinegar, black peppercorns and chili peppers (green or red), giving it a fragrant spicy and sour flavor. It's great to make with a meat dish. If you don't have a wok, you can use a large skillet. This was taught to me by our dear family friends in Beijing who have always welcomed me in their home.