Triple Berry Mousse Cake with Fresh Berry Topping

1 cup cold heavy whipping cream

¼ cup powdered sugar

1 tsp vanilla extract

1 tsp gelatin powder + 2 tbsp water

Berry Mousse Layer:

1½ cups mixed berries (raspberries, cherries, blackberries)

¼ cup sugar

1 tsp lemon juice

1 cup cold heavy whipping cream

1 tsp gelatin powder + 2 tbsp water

Berry Glaze:

½ cup berry puree (strained)

1 tbsp sugar

1 tsp gelatin powder + 1 tbsp water

Decoration: