The beef ’s in the mail

NEW York Prime Beef now has subscribers. Monthly service. Though she didn’t invite me, Tory Burch was a Hamptons hit with their high-end wagyu steaks that are FedEx’d overnight . . . 1992, begun in their home, Susan Magrino and sister Allyn’s f irst p.r. client was Martha Stewart. Hotshots now, they’re booking the whole Rainbow Room for a 25th ann’y party. Still with them, Martha’s not doing the food.