When there are just two of us sharing a double-thick sirloin steak, I sometimes make what I call wallpaper potatoes, because the overlapping paper-thin slices of potato stick together into a golden dappled sheet when roasted on a baking tray. You need floury potatoes, a gadget to slice the potatoes very thinly and an oven that has a fanbake function so that the "wallpaper" cooks evenly. Because you need to use one baking tray for each serving, there isn't room in the oven to make this for more than two, or perhaps three, people.