To prepare the dumplings ahead, cool the red pepper sauce and refrigerate it. Cook the dumplings through step 4, then use a slotted spoon to transfer them from the pot to a bowl of ice water. When thoroughly cool, drain the dumplings and arrange them in one large or 6 individual gratin dishes. Cover and refrigerate until 30 minutes before serving time. Spoon some sauce over the dumplings, sprinkle on about 2 tablespoons of grated Parmesan cheese and bake in a preheated 400° oven for 25 mintues, or until hot and bubbly. Serve with additional warm sauce and grated cheese.