Incredible baked lamb shanks

INGREDIENTS

• 6 sprigs fresh rosemary
• 100 g cold butter
• 15 fresh sage leaves
• 2 sprigs fresh thyme, leaves picked
• sea salt
• freshly ground black pepper
• 4 quality lamb shanks, crown- or French-trimmed
• 12 cloves garlic, unpeeled
• 2 large carrots, peeled and finely sliced
• 1 onion, peeled and finely sliced
• 1 leek, washed, halved and finely sliced
• olive oil
• 2 wineglasses white wine