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Ingredients

• 2 pounds coarsely ground American Kobe beef, chilled
• 1 teaspoon cornstarch
• 1 cup Quick Chicken Stock (recipe below) or packaged low-sodium chicken broth
• 2 tablespoons olive oil
• Sea salt and freshly ground black pepper
• 2 tablespoons ruby port
• 4 brioche buns
• 3 tablespoons unsalted butter, at room temperature
• 1 ounce black truffle, very thinly sliced, about slices per serving (optional)
• 4 handfuls baby greens or sprouts
• Grenadine Pickled Onions (recipe below)
• Fleur de sel
• 1 teaspoon whole black peppercorns
• 1/2 teaspoon whole coriander seeds
• 1 cup red wine vinegar
• 1/2 cup grenadine
• 1 large (about 10 ounces) red onion, thinly sliced

Description

Serious Eats