“Why the heck don’t you make riesling?” It’s a question that German-born winemaker Roman Roth has been asked endless times in his 15 years making wine on Long Island. In some ways, it’s an obvious inquiry—some of the best Riesling in the world is made in the country where Roth started his winemaking career at the age of 16. But, since 1992 Roman has been focusing on varieties like merlot, chardonnay and cabernet franc at Wolffer Estate, where he serves as winemaker, and other wineries like Scarola Vineyards and Roanoke Vineyards, where he also makes the wines. His wines are…