Set aside the 4 best peaches. Coarsely chop the remaining 4 peaches and put them in a 2- to 3-quart saucepan. Add the peach liqueur and granulated sugar, and bring to a simmer over medium heat. Cook, stirring occasionally and mashing the peaches with a potato masher as they soften, until thick and jammy, about 15 minutes. Transfer to a small bowl and cool completely.
Slice the 4 reserved peaches thinly and set aside.
Beat the mascarpone with 1 cup of the cream, the confectioners’ sugar, and vanilla in a medium bowl with an electric mixer on low speed until smooth. Add the remaining 1 cup cream and beat on medium speed to firm peaks, about 3 minutes.
Spread a thin layer of the whipped cream (about 1/4 cup) over the bottom of a 2-quart baking dish. Cover the cream with a single layer of the cookies. Spread half of the peach jam on top of the cookies.
Arrange half of the sliced peaches on top of the jam. Then spread half of the remaining whipped cream on top of the peaches. Repeat the layering once more with the remaining cookies (you may have some left over), peach jam, peaches, and whipped cream. Cover and refrigerate for at least 8 hours.
Before serving, scatter the toasted almonds on top of the cake. Use a large spoon to serve.
Make Ahead Tips
The assembled icebox cake can be refrigerated, covered, for up to 2 days. Garnish with the almonds just before serving.
nutrition information (per serving):
23, Fat Calories
210, Saturated Fat
4, Monounsaturated Fat
33, Polyunsaturated Fat
Photo: Scott Phillips