This is a perfect example of what I call “Friday night food”. At the end of the week, when you’re too tired to cook but still want something nice to kick off the weekend, make this. You just throw it all in a roasting tray and let the oven do its thing. You’re rewarded with moist, flavorful, crackly-skinned chicken and peas and leeks that are deeply flavored with vermouth and the savory chicken juices. It's perfect any time but, as I said, it can’t be beat when you’ve got that Friday feeling!