Braised Lamb With Prunes without bulbs

2/3 cup dried haricot beans (or white Navy or other white beans) 2 1/2 boned shoulder of lamb, tied with string (or leg) 1 oz butter (clarified if you have[...]

6 Tbsp. Extra virgin olive oil 1 x 7 oz lamb shank 20 ounce Lamb stock 1 x Carrot , diced 1 x Leek , diced 1 x Celery stalk, diced 1 sprg rosemary 6 Tbsp.[...]