No candy pieces here. These thumbprint cookies are filled with chocolate ganache.
Turbinado sugar is a light golden brown, large-crystal sugar, sometimes labeled "raw sugar" or "Demerara sugar." It's available in some well-stocked supermarkets and natural-foods stores. If you can't find it, substitute additional granulated sugar. These cookies are best the day they are filled, but you can make both the cookies and the filling up to 3 days ahead. Store cookies airtight at room temperature; chill ganache airtight. Melt ganache over hot water and cool (as described in recipe, following) before using.