1. Prepare the cake batter

• Preheat the oven to 350°F (175°C) and grease three 9-inch cake pans. Line the bottoms with parchment paper.

• In a medium bowl, whisk together the flour, cocoa powder, baking powder, baking soda, and salt.

• In a separate large bowl, whisk the sugar and vegetable oil until combined.

• Add the eggs, one at a time, beating well after each addition. Stir in the vanilla extract.

• In a small bowl, mix the buttermilk and ground lavender. Let it sit for 5 minutes to infuse.

• Gradually add the dry ingredients to the wet ingredients, alternating with the buttermilk mixture.

• Stir in the cooled coffee and mix until the batter is smooth and well incorporated.

2. Bake the cakes

• Divide the batter evenly among the prepared cake pans.

• Bake for 30-35 minutes, or until a toothpick inserted in the center comes out clean.

• Let the cakes cool in the pans for 10 minutes, then transfer to a wire rack to cool completely.

3. Make the blueberry compote

• In a small saucepan, combine the blueberries, sugar, and lemon juice over medium heat.

• Cook for 5-7 minutes until the blueberries start to break down.

• Stir in the cornstarch mixture and cook for another 2 minutes until the compote thickens.

• Remove from heat and let it cool completely before using.

4. Prepare the lavender chocolate ganache

• Heat the heavy cream in a saucepan until it just begins to simmer. Remove from heat and stir in the dried lavender. Let it steep for 5 minutes.

• Strain the cream through a fine sieve to remove the lavender pieces.

• Pour the warm lavender-infused cream over the dark chocolate chips and let sit for 2 minutes.

• Stir until smooth, then mix in the butter for added shine. Let the ganache cool slightly before use.

5. Assemble the cake

• Place the first cake layer on a serving plate and spread a thin layer of blueberry compote on top.

• Add the second cake layer and repeat with another layer of blueberry compote.

• Place the final cake layer on top and pour the lavender chocolate ganache over the entire cake, letting it drip down the sides.

6. Decorate and serve

• Garnish with fresh blueberries, edible lavender flowers, and chocolate shavings for a beautiful finish.

• Let the cake set for at least 30 minutes before slicing and serving.