Today is the autumnal equinox and that means summer is officially over. But with the unusually warm weather we’ve been enduring lately, it doesn’t feel like autumn at all. (What global warming?) Farmers’ markets throughout the city are still selling tomatoes, and Harlem watermelon vendors are still hawking this summer fruit at their sidewalk stalls. Last weekend I was delighted to find some wonderful looking celtuce, a summer vegetable, in Chinatown and thought that it was not too late to make soy-pickled celtuce.