Method

Fill a medium-sized pot with water and bring to a simmer.

Place a mixing bowl containing the chocolate on top of the pot to melt completely.

Once melted, remove from the heat and stir in milk gradually until combined.

With a hand mixer on low speed, beat the mixture for a few minutes until fine lines start to appear.

Evenly pour the mousse into glass jars and refrigerate for at least 2 hours, or until set.

Decorate the top of the mousse with whipped cream and chocolate shavings, if desired.