Preheat the oven to 170°C (340°F).
Blend dried hibiscus flowers to a fine powder using a grinder.
Mix all dry ingredients in one bowl, including the hibiscus powder.
In another bowl, combine all wet ingredients and mix well.
Fold the wet ingredients into the dry ingredients gently until just combined.
Pour the batter into lined baking tins.
Bake for 25 minutes or until a toothpick inserted into the center comes out clean.
Allow the cake to cool in the tin for 10 minutes, then transfer to a wire rack to cool completely.
Whip the double cream until stiff peaks form.
Combine cream cheese, vanilla, and sweetener in another bowl.
Add the whipped cream to the cream cheese mixture, then sprinkle in a teaspoon of hibiscus powder for a natural pink tint.
Mix gently until the color is uniform.
Frost the cooled cake evenly with the creamy hibiscus-infused frosting.
