Combine chopped chocolate with cream and honey in a medium saucepan over low heat and stir frequently until chocolate is completely melted and the mixture is smooth.

Whisk together egg and water in a small bowl until well blended and then stir it into the chocolate mixture in the saucepan. Increase heat slightly and continue cooking while whisking constantly until the mixture starts to bubble. Stir in salt. To make sure it is extra smooth, pour the mixture through a sieve.

Immediately pour the custard into small jars or cups. If using jars, secure the lid tightly. If using cups, place a piece of plastic wrap directly over the surface and refrigerate for at least 4 hours until set. Dust with cocoa powder before serving and serve chilled.