I second Angelina at Rue de Rivoli in Paris. Excellent. Order a Montblanc with it. That should be the calorie intake for a grown man for one day. Very rich!

Otherwise, I have the prejudice that France, Switzerland, Spain, Mexico and Holland probably are the countries where you can get the best hot chocolate. It strikes me as hard to believe that the best hot chocolate could be had in the USA. It's just not culturally anchored here. Sorry.

Till