No plans to step foot in the kitchen this Christmas? Here are seven Harlem restaurants open on the 25th. Amy Ruth's Central Harlem 113 W 116th St between Lenox and Adam Clayton Powell, Jr. Blvds Dine in and order the prix fixe dinner—your choice of herb-roasted turkey with cornbread stuffing and cranberry sauce or honey-glazed ham and two sides ($46.99). The regular menu is also available. Charles Pan-Fried Chicken   Multiple locations Don't wait to place your Christmas Preo