01 - Toss peach slices with lemon juice and sugar in a bowl. Set aside for 10 minutes to macerate and release natural juices.
02 - In a large mixing bowl, whip cold heavy cream until soft peaks form.
03 - Combine mascarpone cheese, sugar, and vanilla extract in another bowl. Mix until completely smooth and creamy.
04 - Gently fold whipped cream into mascarpone mixture until fully incorporated and smooth.
05 - Combine peach juice and peach schnapps (if using) in a shallow dish.
06 - Quickly dip each ladyfinger into peach juice mixture, ensuring they are moistened but not soggy.
07 - Arrange half of soaked ladyfingers in single layer at bottom of 9x7 inch serving dish. Spread half of mascarpone cream over ladyfingers, then top with half of sliced peaches.
08 - Repeat with remaining soaked ladyfingers, remaining mascarpone cream, and remaining peach slices.
09 - Cover and refrigerate for at least 4 hours or overnight to allow flavors to meld. Garnish with fresh mint leaves before serving.