Summer Peach (or Nectarine) Pie

This is the pie to make when summer’s peaches and nectarines are at their sweetest. But here’s the thing about peaches and nectarines: They’re really, really similar. Both can have white or yellow flesh, and both can come in clingstone varieties (in which the flesh sticks to the pit) or freestone varieties (in which the pit and flesh separate easily). In fact, they are almost genetically identical, the main difference being that nectarines possess a recessive gene for smooth, thin skin, whi