Acru 79 Macdougal St., nr. Bleecker St. Warm tomatoes over ice at Acru. Photo: Jonah Rosenberg Chef Daniel Garwood has been working on the tomatoes he’ll serve at his first restaurant, Acru, for a while. They will be, as he puts it, “quite a layered dish.” The ground level is some Montauk tuna, which, granted, is…