This shockingly brilliant magenta frosting is more than just sweet thanks to blackberries, backed up by fresh lemon juice, that get cooked down to jam. Bagged tea is ideal here, as its fine texture effortlessly blends into the batter, infusing the cake with its citrusy zing.
Add edible flowers (like rose petals or pansies) or colorful chicories (such as strips of radicchio or endive) on top for an ethereal finish.
