Prep Filling: Mix ricotta, grated pecorino, egg, and pepper in a bowl until smooth.
Assemble: Place 1 tsp filling in the center of each wrapper. Moisten edges with water, fold, and pleat to seal.
Sear: Heat oil in a skillet. Place gyoza in the pan. Fry until the bottom is crispy (about 2-3 mins).
Steam: Add water to the pan and cover immediately. Steam for 3 minutes.
Finish: Uncover and cook until the water is gone and the bottoms are crunchy again.
Serve: Dust with extra cheese and pepper. Skip the soy sauce; these are perfect as-is!