As promised, Mario Batali served up some pork sandwiches at New Amesterdam Public’s demo market yesterday at the Seaport. Batali’s boots must be heated, as he was wearing shorts in 38-degree weather. Or maybe it was the sheer volume of purveyors who kept Batali toasty: Wild Edibles, Saxelby Cheesemongers, Marlow & Sons, and many more. Considering the cold, New Amsterdam Public had a good crowd — a positive sign for the market’s debated future.