° Place lid on skillet and simmer for about 40 minutes. The beer and oil should hold up for the entire simmer time. If not, add more beer. By the way, the beer must be a basic lager like Miller Light. Not a Corona - not a Dos Equis - not even a Heineken. Higher quality beer is not better. ° Gently fold potatoes with a spatula from the base of the skillet from time to time. You don't want to break up your potatoes anymore than they already will be.