When you're trying to host a special occasion you want to keep everything as stress free and easy as possible. In other words you need a dish that lets the ingredients do the talking, that has elements that can be prepared in advance, and that you can simply stick in the oven for most of the cook. This dish is simply sublime. Tarragon, lemon, butter and chicken are a classical combination, and with good reason. This dish is so much more than it's constituent parts. Equally at home with roast potatoes or mash, or even buttery fondant potatoes, this is a real winner. Tarragon and Lemon Roast Chicken Super succulent, full of taste, and so easy to make large roasting tray with…