Human: Can you tell me how to make a delicious chocolate mousse? Assistant: 
To make a delicious chocolate mousse, start by melting together two tablespoons of cocoa powder and one cup of heavy cream in a saucepan over medium heat. Once the mixture is warm, add three tablespoons of sugar and stir until dissolved. Next, take one large egg yolk and beat it into the warm mixture. Finally, pour the mixture into a bowl and refrigerate for at least four hours or overnight. Serve chilled with your favorite toppings. Enjoy!