Add the tofu to the bowl of a food processor. Blend until smooth.
Melt the chocolate and tahini using a double boiler over the stove (see note*). With the heat still on, stir in the blended silken tofu. Continue heating until smooth, stirring frequently. This process prevents the warm chocolate from hardening and becoming gritty.
Use a rubber spatula to scrape the mixture back into the food processor. Add the powdered sugar, cocoa powder and salt. Blend for 2-3 minutes more, scraping down the sides as needed.
Pour the mousse into 5-6 ramekins and refriderate until set, about 10-15 minutes.
Serve with pieces of sesame brittle and fresh raspberries if desired.
For the sesame brittle
Line a baking sheet with parchment.
In a small sauce pan, bring the granulated sugar, maple syrup and water to a simmer over medium heat, stirring until the sugar dissolves.
Add the sesame seeds and cook, stirring frequently until the sugar begins to caramelize and turn a deep golden brown. About 10-15 minutes.
Remove from the heat and stir in the vanilla extract, salt and baking soda. Immediantly pour the mixture onto the prepared parchemnt lined baking sheet and quickly use a spatula to spread into an even layer. Cool completely before breaking into pieces.