On those increasingly rarer occassions when I feel the need for a sweet drink or someone requests it my signature drink is:
Combined to suite your tastes.
I usually drizzle the chocolate and caramel down the sides of a 12 oz. heavy glass coffee mug(preheated of course), brew a double espresso straight into the mug and then top if off with microfoam while adding the hazelnut syrup at the same time. As an added touch I sometimes will float a mint wafer, or drizzle a bit of chocolate or caramel on top.
For a bit of added spiciness Ill sometimes toss a pinch of cayannne pepper into the dark chocolate.
Java "Loves that Hazelnut!" phile