From a Nationals press release (emphases mine): "The Washington Nationals today announced a partnership with Gifford's Ice Cream & Candy Co.
as the team enters its first season in Nationals Park. Gifford's, founded in Silver Spring, MD, will serve scooped ice cream and novelties
through 2011 at the Nationals' new home in Southeast Washington. Gifford's will have a branded concession stand on the main concourse featuring their scooped ice cream. Additionally, Gifford's has partnered with the Washington Nationals Dream Foundation to create the "Dinger
", a vanilla ice cream and chocolate cookie sandwich which will be sold at various concession stand locations and at Gifford's carts, located throughout the ballpark. A portion of the sale of each sandwich, also offered at all Gifford's locations, will be donated to the Dream Foundation. The "Dinger" will make its debut on March 30, 2008 at the Nationals Opening Night game vs. the Atlanta Braves at 8:05pm."
Also, if you go to a Gifford's between now and the end of the month wearing a Nationals shirt or hat, you'll get 10 percent off.