White Chocolate and Mint Cake

This eye-catching green-and-white cake with white chocolate–mint buttercream has a wonderful freshness to it. I love the simplicity of the decoration of mint sprigs, which always transports me back to the walled garden at Highgrove. It was a treasure trove of interesting mint varieties, each one with its own particular appearance, aroma, and taste. My favorite varieties include peppermint, spearmint, apple mint, pineapple mint, penny royal mint, Corsican mint, and Egyptian mint, to name but