Melt the chocolate

• Chop the chocolate and place it in a bowl over a saucepan of gently simmering water.
• Stir until the chocolate is completely melted and smooth.

Whisk in the water

• Remove the bowl from the heat and whisk in the cold water until fully combined.

Chill and whip

• Place the bowl in an ice bath and whisk the mixture until it thickens and turns pale and fluffy.
• Spoon into glasses and chill until set.