Chop the chocolate

• Chop the dark chocolate bar (and the white chocolate if using) into small, even pieces so it melts evenly.

Heat the cream and milk

• Pour the heavy cream and whole milk into a saucepan.
• Warm over medium-low heat until steaming but not boiling, stirring occasionally.

Melt in the chocolate

• Take the pan off the heat and add the chopped chocolate.
• Whisk gently until completely smooth and glossy.
• For a sweeter hot chocolate, stir in the white chocolate or sugar to taste.

Serve

• Pour into cups and serve hot, ideally with a fresh butter croissant for dipping.