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Pour fresh lemon juice into a bowl and stir in the sugar and zest. Mix until the sugar dissolves fully, you’ll use this syrup to dip the ladyfingers so every bite has that bright citrus hit.
In another bowl, combine mascarpone, heavy cream, powdered sugar, and vanilla. Beat with a hand mixer (or whisk if you prefer) until the mixture is smooth, creamy, and holds soft peaks.
Quickly dip each ladyfinger into the lemon syrup, just enough to coat them without making them soggy. Lay a single layer of dipped ladyfingers in your serving dish. Spread half the mascarpone cream over the top with a spatula. Repeat with another layer of lemon-dipped ladyfingers and the rest of the mascarpone cream, smoothing the surface for a clean finish.
Top with whipped cream if you like, dust lightly with powdered sugar, and sprinkle extra zest or arrange thin lemon slices on top. Cover the dish and refrigerate for at least 4 hours, overnight is even better for the flavors to settle.
Once chilled, slice and serve straight from the fridge. Every bite should feel light, creamy, and citrus-bright.