This creamy scallion dip could be the cooler cousin of ranch dressing or sour cream and onion dip. Grilled scallions add smokiness, while fresh chives and raw scallions lend brightness to the tangy, herb-flecked dip. If you don’t have a grill or grill pan, you can broil the scallions in your oven. Once assembled, the dip benefits from chilling to round out the flavors. At least an hour works, but it's better after a day. It needs nothing more than potato chips alongside, but it’s also great…