Step 1

In a medium bowl, stir together the water, soy sauce, wine, sugar, black bean garlic sauce, scallion, ginger, garlic, Sichuan peppercorns, chile, and star anise.

Step 2

Place the beef in a 9-inch square baking dish. Add the braising liquid. Insert the probe into the thickest part of the largest piece. Cover the baking dish with foil.

Step 3

Transfer to the oven, attach the probe, and cook until the probe reaches its target temperature, 1 to 2 hours.

Step 4

Let the beef rest while you gather the sandwich ingredients.Remove the beef from the braising liquid and slice thinly across the grain.

Step 5

Slice open the shao bing without separating the halves. Spread a layer of hoisin sauce on the bottom. Add slices of beef and top with the cilantro and mustard greens. Drizzle on hot sauce, if desired. Serve with chips.