By Lenn Thompson, Executive Editor Another impressive 2009 riesling from New York? Yes. And this one is from Long Island. Because he mostly works with Bordeaux reds and chardonnay locally, people wondered what German-born winemaker Roman Roth (Wolffer Estate, Roanoke Vineyards) would do with local riesling. When Roth introduced his private label, The Grapes of Roth, several years ago, he started with a merlot, but introduced his first riesling not long after. And of the three rieslings he’s made under the GoR label, Grapes of Roth 2009 Riesling ($22) might be his best yet. Roth purchases the fruit for this…