Bloom the gelatin: pour ice-cold water into a bowl and sprinkle the gelatin powder over it. Immediately mix the water until the gelatin water is dissolved, then let it set in the fridge for 15 minutes.
6 grams gelatin powder, 30 ml ice-cold water
In a heat-proof bowl, add the chocolate. Add the milk, whipping cream, and lavender to a saucepan and bring it to a boil. Reduce the heat, cover, and let the mixture simmer on low for 5 minutes. Turn the heat down and let it sit for another 10-15 minutes to infuse the lavender flavor in the milk mixture.
70 ml liquid whipping cream, 100 ml full-fat milk, 10-15 grams fresh or dried lavender, 200 grams white chocolate
Reheat the mixture and pour it on the chocolate, let it sit for a minute until the chocolate melts, then whisk together until the chocolate is properly incorporated into the milk mixture.
While the mixture is hot, add the bloomed gelatin and whisk until the gelatin is fully melted and incorporated into the milk mixture. Set it aside until it cools down to room temperature.
In a separate bowl, add the remaining liquid whipping cream and whip it with a hand or electric mixer until it reaches medium peaks. You can add a few drops of purple flavor while whisking the cream if you want to make the mousse purple.
225 grams liquid whipping cream, Purple food color
Once the chocolate mixture reaches room temperature, gradually pour it into the whipped cream while folding it gently with a silicon spatula. Do this gently so that the mixture remains light and fluffy.
Pour the prepared mousse into a silicone mold or a bowl and let it chill for 6-8 hours until completely set.