Cut the sweet potato into 1cm chunks. Add to a pot filled with water, bring to a boil and let cook for about 10 minutes on medium heat until soft. Check with the help of a fork if they are tender enough. Drain and set aside.
Meanwhile melt the dark chocolate or chocolate spread (waterbacth or microwave if you have one). Set aside.
Add the sweet potato and silken Tofu to a high powered blender and blend until completely smooth. Then add the chocolate alongside the rest of the ingredients and blend again until well combined and smooth.
Davide the mixture between two jars and lest sit in the fridge for at least 2 hours or overnight.
Enjoy! See "Variations" for ideas how to serve the chocolate mousse or simply enjoy on its own with some creamy yoghurt and extra chocolate shavings on top!