Ingredients
Method
- Combine the melted and cooled butter, flour, sugar, salt, milk, water, eggs, and vanilla in a blender and blend on medium-high speed for 20–30 seconds until the batter is completely smooth and as thin as heavy cream.
- Transfer the batter to a covered bowl or seal the blender tightly and refrigerate for at least 1 hour and up to 24 hours to fully hydrate the flour and relax the gluten.
- Set an 8-inch non-stick skillet over medium heat and coat it generously with a small amount of the reserved butter.
- Once the pan is hot, pour 3 to 4 tablespoons of batter into the center and immediately tilt and swirl the pan in a circular motion so the batter spreads into a wide, thin round.
- Cook for 1 to 2 minutes until the edges look dry and the underside is set and lightly golden, then flip and cook the second side for 30 seconds.
- Transfer the cooked crepe to a large plate and repeat with the remaining batter, buttering the pan before every crepe; separate finished crepes with parchment squares if needed. Repeat until all batter is used — you should get about 28 crepes.
- Allow the finished crepes to cool to room temperature, or cover and refrigerate them for up to 24 hours before assembling; they must not be warm when you start building the cake.
- Stir the espresso powder and warm water together in a small bowl until fully dissolved, then set aside to cool for a few minutes.
- In a large bowl using a hand or stand mixer, whip the cold heavy cream and rum together on medium-high speed until medium peaks form, about 3 to 4 minutes, then set the whipped cream aside.
- In a separate large bowl, beat the mascarpone, sifted confectioners' sugar, vanilla, and cooled espresso liquid together on medium speed until completely smooth and combined, about 2 minutes.
- Gently fold the whipped cream into the mascarpone mixture in two or three additions until just combined; the filling may look slightly curdled but will smooth out once layered.
- Spread a thin smear of filling onto the center of your serving plate to anchor the cake, then place one crepe flat on top.
- Spread about 2 heaping tablespoons of filling evenly over the crepe using an offset spatula, dust lightly with cocoa powder if using, then lay another crepe on top; continue layering crepes, filling, and cocoa until all crepes are used, finishing with a bare crepe on top.
- Using a clean hand or stand mixer, whip the cold heavy cream, rum if using, and confectioners' sugar together on medium-high until medium peaks form, about 3 to 4 minutes.
- Spread or pipe the whipped cream over the top of the assembled cake and dust with cocoa powder if desired.
- Refrigerate the finished cake, uncovered, for at least 3 hours and up to 24 hours before slicing this chilling time is essential for the layers to set and the cake to slice cleanly.
Nutrition
Notes
This is the kind of cake that turns a quiet kitchen into something that feels like a celebration. Every creamy, coffee-kissed layer is worth the patience it takes to build. Make it a day ahead — it only gets better as it rests.
