01 -
Combine blackberries, 1/4 cup sugar, and lemon juice in a small saucepan over medium heat. Cook until berries are softened and release their juices, about 5–7 minutes. Let cool slightly, then puree until smooth.
02 -
In a heatproof bowl set over simmering water, whisk egg yolks and 1/2 cup sugar until thick and pale, about 5–7 minutes. Remove from heat. Fold in mascarpone and vanilla extract until smooth. In a separate bowl, whip heavy cream to stiff peaks and gently fold into the mascarpone mixture.
03 -
Quickly dip each ladyfinger into blackberry puree, ensuring a light soak without oversaturation.
04 -
Arrange half the soaked ladyfingers in a single layer in a baking dish. Spread half the mascarpone cream over the ladyfingers. Repeat with another layer of soaked ladyfingers and remaining mascarpone cream.
05 -
Scatter extra fresh blackberries over the top. Cover and refrigerate for at least 4 hours, allowing flavors to meld and ladyfingers to soften.