Chef Drew Rosen has said it before, and he'll say it again. His eatery, which serves items ranging from a soft duck taco with mango chutney to a rib steak marinated in bourbon and juniper berries, is more of a gourmet restaurant that serves natural foods and plenty of vegetables. The fact that it's Glatt kosher should only reassure diners, since, as Rosen reminds us, kosher is "the purest way of eating.... You know exactly what you're getting. There's complete truth in the menu." There's also absolute honesty in how Rosen's cuisine tastes -- good. Really good. But it's not too surprising, since he has an impressive pedigree, having worked at Mark's Place and Scoozime Trattoria and on Williams Island. So don't think of Terrace Oceanside as kosher. But if you need to label it, try this: a no-brainer for vegetarians, a relief for the lactose-intolerant, and a pleasure palace for the gastronomically minded.