Patrons of beloved East End dining destinations are eagerly waiting for more locations to launch. They’ll soon be able to dine at East Hampton branches of Sant Ambroeus and Tutto il Giorno (Tutto Caffe). In the meantime, Mercato now delivers Eataly here, and Laurent Tourondel brought Sag Harbor’s LT Burger to Westhampton Beach. 66 Newtown Lane, East Hampton, N.Y., 11937. 55 Main Street, East Hampton, N.Y., 11937. 115 Main Street, Westhampton Beach, N.Y., 11978.