Equipment
Ingredients
Oxtail Preparation
- 1000 g oxtail, cut into segments
- 15 ml olive oil
- 5 g kosher salt
The Soup Base
- 45 g unsalted butter
- 1500 g yellow onions, peeled and thinly sliced pole-to-pole
- 5 g kosher salt
- 60 ml dry sherry
- 15 g garlic, minced
- 3 g fresh thyme, tied in a bundle
- 2 bay leaves, dried
- 1500 ml beef stock, high quality, low sodium
Garlic-Gruyere Croutons
- 150 g baguette, sliced 2cm thick and lightly toasted
- 1 garlic, halved for rubbing
- 150 g gruyere cheese, freshly grated
Nutrition (per serving)
Nutrition is estimated per serving. Nutrients without complete source data are omitted.
Full nutrition
- Calories
- 858 kcal
- Protein
- 75 g
- Carbohydrates
- 44 g
- Fat
- 41 g
- Fiber
- 5 g
- Sugar
- 15 g
- Sodium
- 2991 mg
- Saturated Fat
- 18 g
- Monounsaturated Fat
- 6 g
- Polyunsaturated Fat
- 1 g
- Cholesterol
- 44 mg
- Potassium
- 1682 mg
- Calcium
- 349 mg
- Iron
- 4.8 mg
- Magnesium
- 146 mg
- Phosphorus
- 426 mg
- Zinc
- 10.4 mg
- Vitamin A
- 120 mcg
- Vitamin C
- 20 mg
- Vitamin D
- 0.1 mcg
- Vitamin E
- 0.7 mg
- Vitamin K
- 4 mcg
- Vitamin B6
- 0.4 mg
- Vitamin B12
- 0.4 mcg
- Thiamin
- 0.15 mg
- Riboflavin
- 0.16 mg
- Niacin
- 0.4 mg
- Folate
- 51 mcg
- Water
- 242 g
- Alcohol
- 2 g
Sources: Aggregated Public Data, USDA FoodData Central
Method
Heat the olive oil in a large Dutch oven over medium-high heat. Pat the oxtail pieces dry with paper towels, season with 5g of salt, and sear until deeply browned on all sides, about 10 minutes. Remove the oxtail from the pot and set aside.
Reduce the heat to medium-low. Add the unsalted butter to the pot along with the sliced onions and the remaining 5g of salt. Cook slowly, stirring occasionally, until the onions reduce down and turn a deep, rich mahogany color, about 45 to 60 minutes.
Increase the heat to medium. Pour in the dry sherry to deglaze the pot, using a wooden spoon to scrape up all the browned bits from the bottom. Allow the liquid to reduce almost completely.
Return the seared oxtails and their resting juices to the pot. Add the minced garlic, thyme bundle, bay leaves, and beef stock. Bring the mixture to a gentle boil, then cover, reduce heat to low, and simmer gently until the oxtail meat is incredibly tender and falling off the bone, about 2.5 to 3 hours.
Carefully remove the oxtail pieces from the soup using tongs. Pull the meat from the bones, shredding it lightly, and return the meat to the soup. Discard the bones, thyme stems, and bay leaves. Skim any excess fat from the surface of the soup.
Preheat the broiler to 260°C/500°F. Ladle the hot oxtail soup into oven-safe bowls. Rub the lightly toasted baguette slices with the cut sides of the halved garlic clove, place them on top of the soup, and mound the grated gruyere cheese generously over the bread, ensuring it extends slightly over the edges of the bowl.
Place the assembled bowls on a sturdy baking sheet and broil until the cheese is bubbling and deeply browned in spots, about 3 to 5 minutes. Serve immediately with caution, as the bowls will be extremely hot.
Chef's Notes
- Slicing onions pole-to-pole (from root to stem) helps them hold their structure during the long cooking process, preventing them from turning to mush compared to slicing across the equator.
- Oxtail is exceptionally rich in collagen, which melts into gelatin during the long simmer. This imparts an incredibly luxurious, lip-smacking texture to the broth that standard beef stock alone cannot achieve.
- Do not rush the onions. True caramelization requires patience and gentle heat; increasing the temperature will only fry or burn them, resulting in bitter flavors that ruin the entire pot.
- Extending the gruyere cheese over the edges of the oven-safe bowl creates a seal that traps the steam and forms crispy, frico-like cheese edges that elevate the final presentation and taste.
Storage
Refrigerator: 4 days — Store the soup without the croutons. The flavor deepens over time.
Freezer: 3 months — Freeze the soup base only. Do not freeze the croutons or cheese topping.
Reheating: Reheat soup gently on the stove until simmering, then ladle into bowls, top with fresh bread and cheese, and broil.
Troubleshooting
Onions are catching and burning instead of caramelizing
Cause: Heat is too high or onions are not being stirred frequently enough
Fix: Remove pan from heat immediately, discard any distinctly blackened pieces, and lower the heat before resuming.
Prevention: Maintain steady, low heat and monitor closely. If the pan gets too dry, add a tiny splash of water to cool the pan and lift the fond.
Oxtail meat is tough and chewy
Cause: The soup was not simmered long enough for the connective tissue to break down
Fix: Return the soup to a simmer and continue cooking for another 30 to 45 minutes until the meat yields easily.
Prevention: Always test the meat for tenderness before advancing to the final steps.
Cultural Context
Soupe a l'oignon is a staple of French culinary history, famously associated with the working-class markets of Les Halles in Paris where it was served as a hearty, restorative breakfast for laborers. The addition of oxtail borrows from the rustic French tradition of slow-braising less tender cuts of meat to extract maximum flavor and nutrition, marrying two frugal farmhouse techniques into an extraordinarily luxurious dish.
