Braised Lamb Shanks

Name: Braised Lamb Shanks
Ingredients: 2 lamb shanks (3 to 3 1/2 pounds total), excess fat trimmed; Kosher salt; 2 tablespoons extra virgin olive oil; 1 medium yellow onion , chopped; 2 large carrots , chopped; 2 celery ribs , chopped; 3 to 4 medium potatoes , cut into 2-inch chunks; 1 clove garlic , minced; 1 1/4 cups chicken or beef stock; 2 teaspoons fresh thyme, or 1 teaspoon dried; 1 teaspoon fresh rosemary , or 1/2 teaspoon dried; 1 teaspoon dried oregano; 1 bay leaf; 3/4 cup raisins , soaked in 1/2 cup sherry for a couple hours; Mint leaves , for garnish