Thinly slice the cooked Peking duck. Julienne the cucumber and scallions. If using store-bought pancakes or tortillas, warm them gently in a dry pan or microwave for about 10 seconds to soften.
Place one pancake or tortilla flat on a clean surface or plate.
Spoon about hoisin sauce in the center of the pancake and spread it lightly.
Place 2–3 slices of duck on top of the sauce. Add a few strips of cucumber and scallion.
Fold the bottom edge up, then roll tightly from one side to the other (like a burrito). For a smaller appetizer, fold in both sides and cut in half diagonally.
Repeat the process with remaining ingredients. Serve immediately while warm or room temp, with extra hoisin on the side for dipping.
