Lay a clean kitchen towel onto a roasting tray—it helps to keep the ramekins from sliding around once you pour in the water—and set six 4 to 5-ounce ramekins on it (mine measure about 5” diameter, 1” deep). Carefully pour the crème into each dish. Pull the oven wrack out, set the pan on it and, even more carefully still, pour the hot/recently boiled water into the roasting pan until it comes up about halfway up the sides of the ramekins, taking care not to splash any into the crème.