Open the ladyfingers and separate them.
Strain the frozen berries over a bowl, reserve juice. Combine defrosted raspberries with sliced strawberries and blackberries.
Line 4 martini glasses with a single layer of ladyfingers, letting the cakes overlap a bit at the stem. Press the cakes down a bit to fit the lines of the glass. Paint the ladyfingers with raspberry juice, liberally. Beat cheese with cream and sugar on low, 2 minutes. Spoon berries, then sweetened mascarpone into glasses. Top glasses off with a cap of the ladyfingers dotted with berry juice and more mixed berries.
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