01 - In a blender, puree the diced mangoes with lime juice and sugar until completely smooth. Set aside.
02 - In a large bowl, beat the mascarpone, powdered sugar, and vanilla with an electric mixer until smooth and creamy.
03 - In a separate chilled bowl, whip the heavy cream to stiff peaks using an electric mixer or whisk.
04 - Gently fold the whipped cream into the mascarpone mixture until fully incorporated and fluffy.
05 - Combine the cooled coffee and rum (or mango juice) in a shallow dish for dipping ladyfingers.
06 - Quickly dip each ladyfinger into the coffee mixture (do not soak), and arrange a single layer at the bottom of an 8x8 inch serving dish or individual glasses.
07 - Spread half of the mango puree over the ladyfingers, then top with half of the mascarpone cream mixture.
08 - Repeat with another layer of dipped ladyfingers, remaining mango puree, and remaining mascarpone cream.
09 - Smooth the top surface and cover with plastic wrap. Refrigerate for at least 4 hours, preferably overnight for best results.
10 - Before serving, garnish with thinly sliced fresh mango and fresh mint leaves.