These are mini burgers with a slice of foie gras sealed inside each beef patty, so the fat from the liver melts into the meat as it cooks. You also get balsamic caramelized onions on top. The whole thing comes together in 35 minutes, which makes it a realistic weeknight splurge rather than an all-day project.
What makes this version work
Two things matter here. First, the foie gras goes inside the patty, not on top — this means the rendered fat bastes the beef from within, keeping the patty moist even if you cook it a little past medium. Second, tenderloin mince is leaner than the usual 80/20 blend, which is the right call when you’re already adding a fatty stuffing. A fattier grind would make the finished burger greasy rather than rich. Press the beef firmly around each foie gras slice and pinch the seam closed before the patty hits the pan — a loose seal lets the filling leak out and you lose the whole point of stuffing it.
What can go wrong
- The patty splits open during cooking: This happens when the beef is packed too loosely or the patty is too thin at the seam. Make sure the beef layer over the foie gras is at least 5mm thick all the way around, and chill the formed patties for 10 minutes before cooking to help them hold shape.
- The foie gras disappears entirely: If your pan is too hot, the foie gras renders out before the beef sets around it. Use medium heat, not high. You want the beef to firm up quickly enough to trap the filling.
- The onions turn bitter instead of sweet: This usually means the heat was too high when you added the balsamic vinegar. Keep the pan on low once the vinegar and sugar go in, and stir frequently. Rushing this step burns the sugar.
- Patties are undercooked in the center: Mini patties cook fast on the outside but the stuffing adds thermal mass in the middle. Use a meat thermometer — ground beef needs to reach 160°F (71°C) at the center. If the outside is browning too fast, lower the heat and cover the pan for the last minute or two.
- Buns go soggy before serving: Mayo on a soft bun softens quickly. Assemble just before eating, not ahead of time.
Ingredient notes
- Foie gras: Sold in specialty food stores and some online retailers. You want it sliced about 1cm thick so there’s enough to taste inside the patty. Canned or jarred foie gras pâté is not a substitute here — it won’t hold its shape inside the beef. If foie gras isn’t available, a small cube of cold compound butter (butter mixed with a little thyme and black pepper) gives a similar melting effect inside the patty, though the flavor is much milder.
- Tenderloin mince: If your butcher doesn’t carry it pre-ground, ask them to grind a small piece of beef tenderloin for you, or grind it at home. Skip the garnish of truffle fries if you’re short on time — not worth the extra dish when the burger already has plenty going on.
- Arugula: The slight bitterness cuts through the richness of the beef and onions. Baby spinach works in a pinch but is milder, so you lose some of that contrast.
Foie Gras Stuffed Mini Burgers with Balsamic Onions
Equipment
Ingredients
7 oz ground beef - minced beef, tenderloin, about 200g- 3 slices foie gras - approximately 15g (½ oz) each, chilled
3 small hamburger buns - slider-sized
1 medium red onion - sliced into rings
1 tablespoon balsamic vinegar
1 tablespoon brown sugar - 12g
1 cup arugula - fresh ; 20g
1 tablespoon unsalted butter - for sautéing onions
1 tablespoon mayonnaise - for assembling
1 pinch salt - to taste
1 pinch ground black pepper - freshly ground ; to taste
Instructions
- Season the ground beef with salt and pepper. Divide the mince into 6 equal portions (about 33g each). Flatten each portion into a thin disc roughly 7cm (3 inches) wide. Place one chilled foie gras slice in the centre of 3 discs, then top each with a second disc. Press the edges firmly together and pinch to seal completely, ensuring no foie gras is exposed. Shape into round patties about 2cm (¾ inch) thick.7 oz ground beef, 3 slices foie gras, 1 pinch salt
- Heat 1 tablespoon of butter in a 10-inch skillet over medium heat. Add the sliced red onion rings and sauté for 5-6 minutes, stirring occasionally, until softened and translucent.1 tablespoon unsalted butter, 1 medium red onion
- Reduce heat to medium-low. Add the balsamic vinegar and brown sugar, stirring to combine.1 tablespoon balsamic vinegar, 1 tablespoon brown sugar
- Cook for 8-10 minutes, stirring occasionally, until the onions are deeply caramelized and golden brown. Transfer to a plate and set aside.
- Wipe the skillet clean and return it to medium-high heat. Cook the stuffed patties for 4-5 minutes per side without pressing them down, until the internal temperature reaches 160°F (71°C) on an instant-read thermometer. Rest for 2 minutes before assembling.
- Split the slider buns and lightly toast the cut sides in the skillet or under the grill. Spread approximately 1 teaspoon of mayonnaise on each bun base. Place a cooked patty on each bun, top with a generous spoonful of balsamic caramelized onions, and close with the bun top.3 small hamburger buns, 1 tablespoon mayonnaise
- Serve immediately with fresh arugula on the side. Truffle fries make an excellent accompaniment.1 cup arugula
Notes
Nutrition
Frequently asked questions
Can I make the patties ahead of time?
Yes — form and stuff the patties up to 24 hours ahead and keep them covered in the fridge. Cold patties actually hold together better in the pan because the beef fat is firmer going in.
How do I know when the stuffed patty is cooked through?
Use an instant-read thermometer inserted into the side of the patty until the probe reaches the center — you’re looking for 160°F (71°C) for ground beef. Don’t rely on color alone, since the foie gras can make the interior look done before it actually is.
What if I can’t find foie gras locally?
A small cube of cold butter blended with a pinch of thyme and salt is the most practical swap — it melts inside the patty and adds richness, though the flavor is far less intense. Chicken liver pâté is another option but it’s softer and harder to seal inside the beef without it leaking.
Can I cook these on a grill instead of a pan?
A pan gives you more control and keeps the rendered fat in contact with the patty, which is worth it here. A grill works but you risk losing the foie gras through the grates if the seal isn’t perfect — use a grill pan or cast iron skillet on the grill if you want that char.
The recipe makes 3 patties for 2 people — is that right?
Yes, you get 3 small patties from 200g of beef and 3 slices of foie gras, so one person gets two and one gets one as an appetizer portion. If you want equal servings, scale up to 4 patties using about 270g beef and 4 foie gras slices.
What to cook next
- Savory Beef Sausage Rolls
- Bolivian Silpancho Beef Patties
- Fiery Lamb Churrasco Patties
- Olive Beef Polpette Perfection
