What Is a Romaine Heart? Understanding the Crisper, Sweeter Core
                                
                                
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                                    6 min read                                
                            
                                According to produce experts, romaine hearts are the innermost, most tender leaves of a head of romaine lettuce, prized for their crisp texture and mild, sweet flavor. These compact cores offer a delicious alternative to the slightly tougher and more bitter outer leaves, making them a staple in many kitchens.