Ingredients
- 2 lb. ground beef
- Sea salt and freshly ground black pepper, to taste
- 1 tsp. cornstarch
- 1 cup hot veal demi-glace
- 2 tbsp. extra-virgin olive oil
- 1⁄4 cup madeira or red wine
- 4 tbsp. unsalted butter, at room temperature
- 4 truffled brioche buns or hamburger buns
- 10 oz. duck foie gras, sliced into 1/2″-thick slabs and chilled
- 1 oz. black truffle, thinly sliced
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