Marjolaine

Directions

1. 1
   To make the nut meringue, preheat the oven to 350F (175C).
2. 2
   Coat the bottom and sides of a 12 by 18-inch (30 by 46-cm) baking sheet with nonstick cooking spray and line the bottom with parchment paper.
3. 3
   Generously grease the parchment paper, then dust the pan with flour and tap out any excess.
4. 4
   Rub the toasted hazelnuts between your hands or in a kitchen towel to loosen and remove the skins.
5. 5
   In a food processor fitted with the metal blade or in a blender, pulverize the almonds and hazelnuts with the 1 1/3 cups (265 g) sugar and the cornstarch until finely ground, then transfer the mixture to a bowl.
6. 6
   In a stand mixer fitted with the whip attachment, whisk the egg whites on low speed until frothy.
7. 7
   Add the salt, increase the speed to high, and beat until the egg whites form stiff peaks.
8. 8
   Gradually sprinkle the ground-nut mixture over the egg whites, folding it in as you go.
9. 9
   Scrape the batter onto the prepared baking sheet and smooth with a spatula.
10. 10
    Bake until light golden brown, 20 to 25 minutes.
11. 11
    Let cool completely.
12. 12
    To make the praline, lightly coat a baking sheet with cooking spray or line it with a silicone baking mat.
13. 13
    Spread the 1/2 cup (100 g) sugar in an even layer in a medium heavy-bottomed skillet and cook over medium heat until the sugar begins to melt around the edges.
14. 14
    Using a heatproof utensil, slowly drag the liquefied sugar to the center and stir gently until all of the sugar is melted.
15. 15
    Continue to cook, stirring infrequently, until the caramel is deep amber in color and begins to foam a bit.
16. 16
    Remove from the heat, immediately stir in the chopped almonds, then pour the mixture onto the prepared baking sheet and spread it in an even layer.
17. 17
    Let cool completely.
18. 18
    The praline will harden with cooling.
19. 19
    Once cool, break up the praline with your hands.
20. 20
    In a food processor fitted with a metal blade or with a chefs knife, chop the praline into very small pieces.
21. 21
    Transfer to a medium bowl.
22. 22
    To make the ganache, heat the 3/4 cup (180 g) creme fraiche in a small saucepan over medium heat until it just begins to boil.
23. 23
    Remove from the heat and add the chocolate.
24. 24
    Let stand for a minute, then stir until the mixture is completely smooth.
25. 25
    Set aside to cool.
26. 26
    To make the praline and vanilla creams, in a stand mixer fitted with the whip attachment (or in a bowl by hand), whisk together the 3/4 cup (180 g) creme fraiche, the cream, 2 tablespoons (30 g) sugar, and vanilla on medium speed until the mixture is stiff but still glossy.
27. 27
    Dont overbeat.
28. 28
    For the praline cream, stir 2/3 cup (160 ml) of the whipped creme fraiche mixture into the chopped praline.
29. 29
    (The mixture will seem somewhat stiff, but the ingredients will meld and by the time youre ready to use it, the praline cream will be spreadable.)
30. 30
    Set aside.
31. 31
    For the vanilla cream, add the Cognac or brandy to the remaining whipped creme fraiche mixture and whisk lightly until firm.
32. 32
    Set aside.
33. 33
    To assemble the marjolaine, run a knife around the edges of the meringue to loosen it from the pan, place another baking sheet over it, and invert the meringue.
34. 34
    Peel away the parchment paper, holding down the meringue as you pull so that it wont break.
35. 35
    (If you do break the meringue, it can be patched together when you are assembling the layers.)
36. 36
    Using a serrated bread knife, cut the meringue crosswise (not lengthwise) into 4 even rectangles, each about 4 1/2 by 12 inches (11 by 30 cm).
37. 37
    Cover a baking sheet or large rectangular platter with plastic wrap and set one meringue rectangle on top.
38. 38
    Spread 3/4 cup (180 ml) of the chocolate ganache over it in an even layer.
39. 39
    Cover and refrigerate the remaining ganache.
40. 40
    Top the ganache layer with a second meringue rectangle and spread evenly with the vanilla cream.
41. 41
    Top with a third meringue rectangle and spread evenly with the praline cream.
42. 42
    Top with the last meringue rectangle.
43. 43
    Wrap the marjolaine in plastic wrap and refrigerate it overnight.
44. 44
    To finish the cake, remove the marjolaine and the reserved ganache from the refrigerator.
45. 45
    Trim the rough edges of the marjolaine with the serrated knife.
46. 46
    Gently warm the ganache over a small pan of simmering water until its spreadable, then spread it evenly over the top and sides of the cake.
47. 47
    Using the serrated knife, slice the marjolaine crosswise into slabs, dipping the knife blade in hot water and wiping it clean after each cut.
48. 48
    Serve at room temperature.
49. 49
    Marjolaine is flavorful on its own, though you might want to offer some lightly sweetened whipped cream (page 239) alongside.
50. 50
    The assembled unfrosted cake can be stored in the refrigerator for up to 3 days.
51. 51
    Some of the components can be made ahead: The meringue can be made up to 3 days in advance and wrapped in plastic.
52. 52
    The praline can be made 1 week in advance, chopped, and kept in an airtight container.