Black Sesame and White Chocolate Mousse Cake

Name: Black Sesame and White Chocolate Mousse Cake
Ingredients: For the sponge cake; 35 grams all-purpose flour; 15 grams corn starch; 10 grams black sesame powder; 2 large eggs; 30 grams granulated sugar; 30 grams whole milk; 20 grams butter; 1/2 teaspoon pure vanilla extract; 1 pinch salt; For the mousse layers; 125 grams heavy cream; 30 grams black sesame powder; 1 large egg; 20 grams granulated sugar; 40 grams whole milk (for the sesame mousse); 25 grams whole milk (for the white chocolate mousse); 50 grams good quality white chocolate, chopped into small pieces; 4 grams gelatin powder; 1 tablespoon water (to soak gelatin)