Duck Confit Burger with Caramelized Onion and Mustard Recipe
Introduction
This duck confit burger is a delicious twist on the classic burger, offering rich, tender duck paired with sweet onion marmalade and peppery salad leaves. It’s an indulgent yet easy meal to prepare, perfect for impressing guests or treating yourself at home.

Ingredients
- 1 tbsp olive oil
- 1 red onion, finely sliced
- 2 tbsp onion marmalade
- 500g pack duck leg confit
- 4 brioche burger buns
- 1 tbsp butter, at room temperature
- 1 tbsp Dijon mustard
- 80g bag rocket or frisée salad leaves
Instructions
- Step 1: In a small saucepan, heat the olive oil over low heat. Add the sliced red onion and fry gently for 10-15 minutes until the onion is very soft. Stir in the onion marmalade, then remove from heat.
- Step 2: Cook the duck confit according to the package instructions. Once cooked, remove the duck meat from the bone and shred it into thick pieces. Season to taste.
- Step 3: Cut the brioche buns in half and spread the cut sides with a little softened butter. Place the buns butter-side down on a hot griddle pan for about 1 minute, until grill marks appear.
- Step 4: Spread Dijon mustard on one half of each bun and the onion marmalade mixture on the other. Assemble the burgers by layering the shredded duck and salad leaves between the bun halves. Serve immediately.
Tips & Variations
- For extra flavor, add a slice of melted cheese like Gruyère or Swiss to complement the duck.
- Try swapping rocket or frisée for crisp watercress or baby spinach for a different peppery note.
- If you prefer a spicier kick, mix a little harissa or sriracha into the onion marmalade before spreading.
Storage
Store any leftover shredded duck covered in the refrigerator for up to 2 days. Reheat gently in a pan over low heat to keep it tender. Assemble the burgers fresh to prevent the buns from becoming soggy.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use duck breast instead of duck leg confit?
Yes, you can use cooked duck breast, but it will need to be shredded and may not be as tender and rich as duck leg confit.
Can I make the onion marmalade from scratch?
Absolutely! Slowly caramelize sliced onions with a bit of sugar and vinegar to create a homemade onion marmalade for a fresh and flavorful alternative.
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Duck Confit Burger with Caramelized Onion and Mustard Recipe
- Total Time: 40 minutes
- Yield: 4 burgers 1x
Description
This Duck Confit Burger recipe combines tender, flavorful shredded duck confit with a sweet onion marmalade and peppery rocket leaves, all sandwiched in toasted brioche buns. The slow-cooked duck leg confit provides rich, succulent meat, complemented by the caramelized onions and smooth Dijon mustard for a gourmet twist on a classic burger.
Ingredients
For the Onion Marmalade
- 1 tbsp olive oil
- 1 red onion, finely sliced
- 2 tbsp onion marmalade
For the Duck and Assembly
- 500g pack duck leg confit
- 4 brioche burger buns
- 1 tbsp butter, at room temperature
- 1 tbsp Dijon mustard
- 80g bag rocket or frisée salad leaves
Instructions
- Prepare the Onion Marmalade: In a small saucepan, heat the olive oil over low heat. Add the finely sliced red onion and fry gently for 10-15 minutes until the onions become really soft and caramelized. Stir in the onion marmalade, then remove the pan from the heat to set aside.
- Cook the Duck Confit: Following the package instructions, cook the duck leg confit until heated through. Once cooked, remove the meat from the bone and pull it into thick shreds. Season to taste with salt and pepper as desired.
- Toast the Buns: Cut the brioche buns in half. Spread the cut sides with a little butter and place them butter-side down on a hot griddle pan over high heat. Toast for about 1 minute, or until griddle lines appear and the buns are lightly browned.
- Assemble the Burgers: Spread Dijon mustard on one half of each bun and the prepared onion marmalade on the other half. Fill the buns with the shredded duck confit and add a generous handful of rocket or frisée salad leaves. Serve immediately while warm.
Notes
- You can substitute rocket with other peppery greens like arugula or mixed salad leaves.
- If duck confit isn’t available, slow-cooked pulled duck can work as an alternative.
- For a richer flavor, you can add a slice of melted cheese like Gruyère or Swiss inside the burger.
- Ensure buns are toasted just before serving to keep the texture crisp.
- Prep Time: 15 minutes
- Cook Time: 25 minutes
- Category: Main Course
- Method: Stovetop
- Cuisine: French-inspired
Keywords: Duck confit burger, gourmet burger, French recipe, brioche buns, onion marmalade, duck leg confit, rocket salad, easy duck recipe

