Chop your choclate into small pieces or like thick chocolate shavings to make it easier to melt. Transfer into a larger heatproof bowl and add the boiling water and whisk to combine.
Whisk to combine the chocolate and water till it resembles a watery brown liquid.
Transfer to a high speed blender and blend for 2 minutes to create lots of air and bubbles.
Pour into your glass dessert jars and refridgerate for 6-8 hours till firm.
Notes
70% cocoa solids make this chocolate mousse set really well.