Classic French Onion Soup with Bone Marrow
A luxurious take on traditional French onion soup featuring deeply caramelized yellow onions simmered in a 12-hour homemade beef bone stock enriched with red wine, sherry, and Cognac. Each bowl is layered with melt-in-your-mouth roasted bone marrow, toasted baguette slices, and an abundant crust of broiled Comté and Gruyère cheeses.
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🍳 Cooking Flow
Roast beef bones and aromatics, then simmer with red wine and water for 6-12 hours to make rich stock. → Slice onions thinly and slowly caramelize in a Dutch oven over low heat for 1.5 hours. → Deglaze onions with sherry, add beef stock and thyme bundle, and simmer for 30 minutes before finishing with Cognac. → Roast marrow bones, toast baguette slices, and grate Gruyère and Comté cheeses. → Assemble soup in oven-safe bowls with marrow, toasted bread, and cheese, then broil until bubbly and garnish with chives.
Cooking Steps
Brief Cooking Order
Roast beef bones and aromatics, then simmer with red wine and water for 6-12 hours to make rich stock. → Slice onions thinly and slowly caramelize in a Dutch oven over low heat for 1.5 hours. → Deglaze onions with sherry, add beef stock and thyme bundle, and simmer for 30 minutes before finishing with Cognac. → Roast marrow bones, toast baguette slices, and grate Gruyère and Comté cheeses. → Assemble soup in oven-safe bowls with marrow, toasted bread, and cheese, then broil until bubbly and garnish with chives.
Introduction
A luxurious take on traditional French onion soup featuring deeply caramelized yellow onions simmered in a 12-hour homemade beef bone stock enriched with red wine, sherry, and Cognac. Each bowl is layered with melt-in-your-mouth roasted bone marrow, toasted baguette slices, and an abundant crust of broiled Comté and Gruyère cheeses.
Step 1
Preheat the oven to 415°F (215°C). Arrange the beef bones (oxtail, knuckles, marrow bones) on a wire rack set in a rimmed baking sheet and roast for about 30 minutes until deeply browned.
Step 2
Roughly chop the celery, carrots, halved onion, and halved garlic head. Add them to the baking sheet during the final 15 minutes of roasting to caramelize with the bones.
Step 3
Peel the yellow onions, halve them from top to bottom (pole to pole), and slice them paper-thin using a mandoline to maintain consistent thickness.
Step 4
Heat neutral oil in a large Dutch oven over low heat. Add all sliced onions along with salt to draw out moisture. Cook low and slow, stirring regularly to prevent scorching, for about 1 hour and 20 minutes until completely soft and lightly golden.
Step 5
Transfer the roasted bones, caramelized vegetables, a spoonful of rendered pan fat, bay leaves, peppercorns, salt, and tomato paste into a large stockpot. Pour in the red wine and cold water to cover. Bring to a gentle simmer and cook low and slow for 6 to 12 hours. Once finished, strain through a fine-mesh chinois.
Ingredients List
Important Notes
Caramelizing onions properly requires patience; keep the heat low and slow for at least an hour to an hour and a half rather than rushing it on high heat, which burns the sugars rather than breaking down fibers.
Cutting onions pole-to-pole (from top to root) helps preserve fiber structure and yields a silky, pleasant texture once simmered.
Tying the thyme sprigs together with butcher's twine prevents loose stems from getting lost in the soup and makes removal effortless.
Combining Comté with Gruyère creates a superior balance: Comté brings a rich, nutty flavor while Gruyère delivers optimal melting and stretch.
Drying the baguette slices in a moderate oven ensures they hold up to the hot broth without turning into soggy mush immediately.
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