Fillet Knife: A fillet knife essential for cleanly cutting the flounder filets, and I really do recommend getting one if you prepare fish often. Mixing Bowl: This goes without saying, but a large mixing bowl is a must for combining the stuffing ingredients. You might also consider a small bowl or two, or even ramekins, for holding chopped ingredients. Small Pan: A small pan for sautéing the stuffing mixture. Large Skillet: Preferably cast iron, but stainless steel or copper frying pan will also do, to sauté the initial stuffing ingredients. Baking Dish: Use a baking dish, baking sheet, or a baking pan to cook the flounder rolls.