So it's been a good day for me to reminisce about what is still, in my memory, my favorite hot chocolate. Back when I lived in Toronto, JS Bonbons had a Queen Street outlet. It closed long ago (as did, last I checked, JS Bonbon's other shop, where I once threw snow balls at the second-story window to try to get the attention of the class I was meant to be attending but could find no way into).
The Queen Street shop made hot chocolate using truffle ganache. The same ganache they used to fill their truffles. They had three or four varieties. One was the extremely good white-chocolate-and-thyme one. The other was the absolutely amazing dark chocolate and lavender one.
Put it this way. I used to drag visiting friends there in the sweltering heat of August to try the wonders of their hot chocolate. That's how amazing it was.