A rich, deeply savory French onion soup inspired by Martha Stewart’s classic entertaining style. Sweet caramelized onions simmer in a full-bodied beef broth, finished under a blanket of toasted baguette and bubbly Gruyère cheese. The result is a comforting, restaurant-quality bowl with a golden, cheese-pull crust.
Storage: Cool leftover soup (without the bread and cheese topping) completely, then refrigerate in an airtight container for up to 4 days or freeze for up to 3 months. Thaw overnight in the refrigerator before reheating. Make-ahead: The soup can be made through step 4 up to 3 days ahead; cool, cover, and refrigerate, then reheat gently on the stovetop before topping and broiling. To reheat: Warm the soup in a saucepan over medium-low heat until steaming, about 10 minutes, then ladle into bowls and broil with the baguette and cheese as directed. Do not freeze the assembled soup with the cheese topping.
Keywords: French onion soup, Martha Stewart french onion soup, caramelized onion soup, beef broth soup, Gruyère cheese soup, classic French onion soup, homemade onion soup, cozy soup recipe, stovetop soup, entertaining soup