Sous Vide Honey-Rosemary Lamb Shank

Ingredients

• 4 lamb shanks
• 2 tablespoons olive oil
• 2 cups all-purpose flour for dusting
• 1 medium yellow onion, peeled and thinly sliced
• 4 garlic cloves, peeled and smashed
• 4 medium carrots, medium dice
• 4 stalks celery, medium dice
• 3 tablespoons tomato paste
• 1/2 cup sherry wine vinegar
• 1 cup red wine
• 3/4 cup honey
• 1 quart beef stock
• 4 sprigs fresh rosemary
• 2 dried bay leaves
• Kosher salt and freshly ground black pepper