After trying every turkey-roasting method under the sun, I've finally settled on this as absolutely the best. The secret? Slow down the cooking of the breast area, which tends to get overcooked and dried out before the dark meat is done, with a cover of aluminum foil. These instructions are for a 12-pound turkey, which serves eight people. But you can easily scale it up for a bigger bird. Estimate about one pound of meat per person (one and a half pounds if you want lots of…