Method
1 Finely chop the chocolate into small pieces. The pieces have to be able to dissolve easily in the liquid.
2 Place the milk into a small, thick-bottomed pot on low heat and bring to a low simmer. Whisk once in a while to ensure that the milk doesn't stick to the bottom of the pan.
3 Add the vanilla, powdered sugar, salt, and chocolate and whisk vigorously until the chocolate has melted.
4 Heat for another 4 minutes, constantly stirring.