Crack open the beer and pour out around two-thirds of it (or drink it!), then carefully lower the chicken cavity onto the can so it looks like it's sitting up. Position the chicken so it's upright on a roasting tray, then place in the oven and cook for around 1 hour 10 minutes, or until golden and cooked through. To check it's done, insert a knife into the thickest part of the thigh – the juices should run clear.