Plump Dumpling Oil Spill Threatens East Village FloraSince it briefly threatened the supremacy of St. Marks Place’s Dumpling Man when it opened two years ago, Plump Dumpling, an itty-bitty hut on 11th Street near Second Avenue, has earned a loyal East Village following. But is the business engaging in dumpings as well as dumplings — that is, dumping its cooking oil into the three tree planters outside the apartment building next door?