01 - 
                        1 1/2 pounds of shrimp, shells on.
                      
                    
                      
                        02 - 
                        1 small onion, chopped into tiny bits (fills 1/2 cup).
                      
                    
                      
                        03 - 
                        Two lemons, squeezed for juice and grated for zest.
                      
                    
                      
                        04 - 
                        A spoonful of Worcestershire sauce.
                      
                    
                      
                        05 - 
                        A handful of parsley, finely chopped.
                      
                    
                      
                        06 - 
                        A pinch of celery seeds.
                      
                    
                      
                        07 - 
                        A pound of soft, unsalted butter.
                      
                    
                      
                        08 - 
                        A handful of dill, minced small.
                      
                    
                      
                        09 - 
                        A couple spoons of sea salt, plus more for cooking.
                      
                    
                      
                        10 - 
                        A little sprinkle of black pepper.