01 - Blend diced mangoes with lime juice and sugar until completely smooth. Reserve at room temperature for assembly.
02 - Using electric mixer, beat mascarpone cheese, powdered sugar, and vanilla extract until completely smooth and creamy, approximately 2 minutes.
03 - In separate chilled bowl, whip heavy cream to stiff peaks. Gently fold whipped cream into mascarpone mixture until fully incorporated and fluffy.
04 - Combine cooled coffee with rum or mango juice in shallow dish wide enough for dipping ladyfingers.
05 - Working quickly, dip each ladyfinger briefly into coffee mixture (do not soak). Arrange single layer in 8x8 inch dish or individual serving glasses.
06 - Spread half the mango puree evenly over ladyfingers. Top with half the mascarpone cream, smoothing surface with spatula.
07 - Repeat with another layer of dipped ladyfingers, remaining mango puree, and remaining mascarpone cream. Smooth top surface completely.
08 - Cover tightly with plastic wrap. Refrigerate minimum 4 hours, preferably overnight, for flavors to meld and texture to set.
09 - Top decoratively with thinly sliced fresh mango and mint leaves just before serving.