Seems like most online recipes for sesame mousse use the more expensive and harder to buy sesame paste / have to grind your own black sesame. I only had black sesame powder (cheap and easy to find in Asian market) at home and using a green tea mousse recipe as guideline, I came up with a pretty decent black sesame mousse. I used a small amount of cream cheese to replace raw egg yolks in the green tea recipe as strong egg yolk taste may cover up black sesame fragrance yet I need some thickener, so a small amount of cream cheese is a good choice.
Black Sesame Mousse (with green tea mousse on green tea sponge cake and chocolate sponge cake)
Grace's Kitchen 