Video courtesy of The Feast By Lenn Thompson, Executive Editor Now that summer is upon is, Terroir Wine Bar's annual Summer of Riesling program back — and bigger than ever. The brain child of Terroir's Wine Director and Co-Owner Paul Grieco has grown over the last few years and this year Grieco — long a supporter of New York wines — has signed more than 160 restaurants and wine bars across the country on to take part. Each has agreed to pour three rieslings by the glass through September 24. There are many restaurants in New York City participating, but…