Why does my fish curl up when cooking?
            Chef's answer
            
                
                    
                        
                
            
        
    
                            whatever method used will produce a 'curled' piece of fish with the skin on if the heat is too high. The skin cooks at a different rate than the flesh. Think of a bimetal thermal-switch. With the skin off the same thing happens when there's heat applied to one side and not the other. 
                    
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