Creating the Chocolate and Raspberry Mousse Cake is a rewarding endeavor. Follow these steps carefully for a delightful result:

For the Chocolate Sponge:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Grease and flour an 8-inch round cake pan.
2. Mix Dry Ingredients: In a bowl, whisk together flour, cocoa powder, sugar, baking soda, and salt.
3. Add Wet Ingredients: In a separate bowl, beat eggs, whole milk, oil, and vanilla extract until well combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, mixing until smooth. Carefully stir in boiling water, ensuring the batter is well combined.
5. Bake: Pour the batter into the prepared pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
6. Cool the Sponge: Allow the cake to cool in the pan for 10 minutes, then transfer to a wire rack to cool completely.

For the Raspberry Mousse:

7. Prepare Raspberries: In a blender, puree the fresh raspberries and strain through a fine mesh sieve to remove seeds.
8. Combine with Sugar: In a pot, combine raspberry puree and granulated sugar over low heat until the sugar dissolves.
9. Dissolve Gelatin: In a small bowl, sprinkle gelatin over cold water and let it sit for a few minutes. Then, stir it into the warm raspberry mixture until dissolved.
10. Whip Cream: In a separate bowl, whip heavy cream, powdered sugar, and vanilla extract until soft peaks form.
11. Fold Mixtures: Gently fold the raspberry mixture into the whipped cream until well combined.
12. Chill Mousse: Pour the raspberry mousse over the cooled chocolate sponge and refrigerate for at least 2 hours, allowing it to set.

For the Dark Chocolate Mirror Glaze:

13. Prepare Gelatin: In a small bowl, sprinkle gelatin over cold water and allow to bloom for about 5 minutes.
14. Heat Ingredients: In a saucepan over low heat, combine chopped chocolate, heavy cream, and corn syrup. Stir until smooth and shiny.
15. Add Gelatin: Remove from heat and stir in the bloomed gelatin and vanilla extract until fully dissolved.
16. Cool Slightly: Allow the glaze to cool to room temperature, ensuring it’s still pourable but not too hot.
17. Glaze the Cake: Remove the cake from the refrigerator and pour the glaze evenly over the set mousse. Allow excess to drip off and chill again if necessary.