How to make Colm O'Gorman's perfect Easter Sunday roast lamb

Colm O'Gorman's perfect Easter Sunday roast
I love slow-cooked lamb; is the perfect Easter Sunday roast. For this recipe, I have used lamb shoulder instead of a leg of lamb as I find it is better suited to a low, slow cook like this.
You could serve this roast lamb with more traditional sides such as roast potatoes and roasted root vegetables, or you could go for a full Middle Easter feast and have it with flatbreads, pickled chillies, hummus, and a herby green salad.