Dutch Bros. fans — known as the Dutch Mafia — can pick up their favorite brews from the new drive-through Prosser shop.It opened July 2 at 119 Merlot Drive, just off Interstate 82.The 16-by-30-foot stand also includes a 17-by-17-foot storage area.Erin and Ryan Bates own the Prosser and Sunnyside franchises.On...