Don't be daunted by the idea of making souffle. If you heed the recipe instructions, you'll find that it's a simple enough process. Besides, the impressive and indulgent result will be worth all your efforts. This savory souffle has flaked hake folded into the custard base, which is made with constant stirring to achieve the silken consistency. When folding in the beaten egg whites, do so gently to avoid deflating them. And never open the oven door until it's time to take the souffle out.