Mario Batali and Joe Bastianich, the masterminds of an Italian restaurant empire, have opened their first New York City restaurant in a decade. La Sirena occupies a sprawling space in the Maritime Hotel. The Chelsea neighborhood restaurant is open from breakfast to dinner, marking the first time the duo has ever offered breakfast (Amaretti Mascarpone Pancakes, anyone?) in any of their restaurants, which total nearly three dozen in several American cities and in Singapore. Here’s a look inside their newest.