Purple Layer Cake with Blueberry Frosting and Ganache Drip

Common Mistakes to Avoid
Little mistakes can ruin the overall appearance or texture of a cake. These are the common mistakes I see.

Failure to reduce blueberry purée enough: This will result in your frosting being runny. Simmer more to thicken and strain more.
Ignoring the chill before pouring ganache: The ganache drips will slide right off, so chill the cake after it’s been frosted.
Mixing the cake batter too much: Your crumb will become tough. You want to stop mixing as soon as the batter is combined after the dry ingredients have been added.
Using cold ingredients: This can create lumps and uneven rising in the cake. You want to use your ingredients at room temperature.
Using too much food colouring: Start with a drop, then gradually add more to reach the desired colour. If you add too much colouring, it can create a bitter taste.
Cutting too soon: The layers will slide, so you have to wait.
Healthy Tips
Slice modestly—smaller pieces feel more indulgent. For more fibre, replace ½ of the flour with white whole wheat. To add natural sweetness, reduce powdered sugar by ½ cup and increase blueberry purée. To reduce fat, use light cream cheese in the frosting. To stretch the dessert and add antioxidants, serve the dessert with fresh berries.

Tips and Variations
For a velvety smooth frosting, strain the purée 2 times. To achieve a more prominent berry flavour, you can add ½ teaspoon of blueberry extract. For a more subtle contrast, you can use vanilla in place of the chocolate layers. For a different flavour and purple colour, use blackberries or mixed berries. If you want it to be gluten free use a 1:1 flour blend. For more elegance, you can add edible flowers or gold leaf.