01 - Blend diced mangoes with lime juice and sugar until completely smooth. Transfer to a bowl and set aside.
02 - Combine mascarpone cheese, powdered sugar, and vanilla extract in a large mixing bowl. Beat with electric mixer until smooth and creamy.
03 - In a separate chilled bowl, whip heavy cream until stiff peaks form. Gently fold whipped cream into mascarpone mixture until fully incorporated and fluffy.
04 - Combine cooled coffee with rum or mango juice in a shallow dish suitable for dipping ladyfingers.
05 - Quickly dip ladyfingers into coffee mixture for 1-2 seconds per side. Arrange in a single layer at the bottom of an 8x8 inch serving dish or individual glasses.
06 - Spread half the mango puree evenly over ladyfingers. Top with half the mascarpone cream, spreading smoothly to cover.
07 - Repeat with another layer of dipped ladyfingers, remaining mango puree, and remaining mascarpone cream. Smooth top surface evenly.
08 - Cover tightly with plastic wrap and refrigerate for minimum 4 hours or overnight for optimal texture and flavor development.
09 - Top with thinly sliced fresh mango and mint leaves just before serving. Serve chilled.