At last I pass by Second Cup the other day, they didn't have the cookie on shelf. The girl said it's 2 pieces of BUTTER COOKIES with ~Raspberry Jelly in the middle. It sound right.
For myself I see Shortbread as the king of Butter Cookies. But normally cookbook divide these 2 into 2 different type. Buy some from stores to try. Or try some recipe on web, video on U-tube.