I had to heat this a lot longer than the recipe said (10 minutes) before it started to thicken up. I also added the chocolate chips right into the mixture without melting them, because I figured they'd melt in the hot liquid. It was a little grainy when I ate it, so perhaps I should have melted the chocolate first. I also needed to use more chocolate than the recipe said, because it wasn't very chocoaltey looking (and what fun is that?). But they turned out nicely, and the hint of lime with the the chocolate was perfect.
It was a perfect Valentine's Day dinner!!