Sous Vide Beer-Braised Brisket

Ingredients

• 1 (3-pound) flat-cut brisket
• 1 tablespoon smoked sea salt
• 2 teaspoons freshly ground smoked black peppercorns
• 1 onion, thinly sliced
• 12 ounces beer, preferably a pale ale
• 3 tablespoons light brown sugar
• 2 tablespoons liquid smoke
• 1 tablespoon Dijon mustard