This roast chicken with creamy garlic and green peppercorn sauce is Ottolenghi’s revisitation of what the English know as the “Sunday roast”. Every Sunday they meet with family or friends to enjoy a good piece of roast meat, the most traditional being beef. They accompany it with roasted or mashed potatoes, roasted root vegetables, the famous Yorkshire pudding and of course “the gravy sauce”. Here Ottolenghi chose chicken thighs, which are tender and juicy with crispy skin. The sauce is just crazy. It is creamy and slightly tangy. In addition to being delicious, this dish is very easy to make.…