The Fourth of July demands two things: Potato salad and red, white and blue everything. Well. The Fourth of July also demands fireworks. And ice cream sandwiches. And grilled meats. And something for the vegetarians. The Fourth of July is actually a really demanding brat, isn't it? You never hear Flag Day getting all mouthy like that. Potato Things: Just for the sake of hushing up the Fourth of July's fresh mouth, the potato things…