Another good dish, but make sure you leave plenty of time to make it!
It's actually quite an easy recipe from a technical perspective, it just takes about 3 hours including prep time.
I would definitely recommend adding some salt to the beans as well as the finished sauce. How much is up to your own taste. As written, the only salt in the recipe is the 1/2 teaspoon you sprinkle on the lamb at the very start.