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                                            Prep Time: 15 Minutes Cook Time: 30 Minutes  | 
                                            Ready In: 45 Minutes Servings: 12  | 
                                         
                                        
                                     
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                    You can make this stock with a variety of fish carcasses (from nonoily fish) or with just one type  whatever your seafood market can give you. Ingredients: 
                    
                        
                                                1 tablespoon unsalted butter, softened  |  
                                                3 lb mixed bones and heads of white-fleshed fish (such as monkfish, turbot, red snapper, striped bass, porgy, grouper, and/or cod), gills removed and bones and heads rinsed well  |  
                                                2 large onions, sliced  |  
                                                1 bunch parsley stems (reserve leaves for another use)  |  
                                                6 tablespoons fresh lemon juice  |  
                                                1 1/2 teaspoons salt  |  
                                                10 cups cold water  |  
                                                1 1/2 cups dry white wine  |  
                                                
                     
                    Directions: 
                    
                        
                            
                                1. Spread butter in bottom of a 6- to 8-quart heavy pot. Add fish bones and heads, onions, parsley stems, lemon juice, and salt and cook, covered, over moderately high heat, without stirring, 5 minutes. (Mixture will steam in its own juices.) Add water and wine and bring to a boil, then reduce heat and simmer, uncovered, skimming any foam, 25 minutes. 2. Pour stock through a fine sieve into a large heatproof bowl, pressing on and discarding solids. If not using stock immediately, cool, uncovered, before chilling, covered. 3. Cooks' note: ·Stock can be made 2 days ahead and chilled, covered, or frozen 1 month.                              | 
                         
                         
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