Double Mustard Crusted Pork Roast with Jus

Name: Double Mustard Crusted Pork Roast with Jus
Ingredients: 1/2 cup stone-ground mustard; 1/2 cup Dijon mustard; 1 1/2 tablespoons soy sauce; 1 tablespoon black pepper, freshly cracked; 1 tablespoon chopped fresh thyme leaves; 10 garlic cloves, roughly chopped; 1 (4 to 5 pound) bone-in pork loin roast; 1 fennel bulb, trimmed and sliced into 1-inch pieces; 1 large yellow onion, peeled and sliced into 1-inch rounds; 2 large carrots, cut into large pieces; 2 tablespoons olive oil; Kosher salt and freshly cracked black pepper; 2 cups panko bread crumbs; 1 cup vermouth; 3/4 cup chicken stock; 1 tablespoon unsalted butter