01 - Blend diced mangoes with lime juice and sugar until completely smooth. Reserve in refrigerator until assembly.
02 - Beat mascarpone, powdered sugar, and vanilla extract with electric mixer until completely smooth and creamy, about 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 for dipping ladyfingers.
05 - Quickly dip each ladyfinger into coffee mixture (1-2 seconds per side). Arrange single layer at bottom of 8x8 inch dish or individual serving glasses.
06 - Spread half the mango puree over ladyfingers, then top with half the mascarpone cream, spreading evenly.
07 - Add second layer of dipped ladyfingers, remaining mango puree, and remaining mascarpone cream. Smooth top with spatula.
08 - Cover tightly with plastic wrap and refrigerate minimum 4 hours, preferably overnight for best texture and flavor integration.
09 - Top with thinly sliced fresh mango and mint leaves just before serving.