Chocolate Swiss Roll

Ingredients

Method

1. 1

   Place a rack in middle of oven; preheat to 350°F. Line bottom of a 17x12" rimmed baking sheet with parchment paper (do not grease pan or parchment). Separate yolks from 4 large eggs, room temperature, over a medium bowl to catch egg whites. Place yolks in a large bowl and set aside.

2. 2

   Add 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, ½ tsp. cream of tartar, and ½ cup (100 g) granulated sugar to egg whites and beat with an electric mixer until sugar is dissolved and egg whites are glossy and stiff peaks form, 8–10 minutes. (You can also beat on medium-high speed in the bowl of a stand mixer fitted with the whisk attachment.)

3. 3

   Add remaining ½ cup (100 g) granulated sugar to reserved egg yolks and whisk to combine, about 1 minute. Add ½ cup (32 g) unsweetened cocoa powder, preferably Dutch-process, ⅓ cup vegetable oil, 1 tsp. vanilla bean paste or vanilla extract, and ⅓ cup room-temperature water and whisk until cocoa is fully dissolved. Sift ½ cup (58 g) bleached cake flour and ½ tsp. baking powder over, then whisk vigorously to combine.

4. 4

   Add one fourth of meringue to flour mixture and mix thoroughly (you can use either a whisk or rubber spatula). Add remaining meringue in 3 batches, gently folding after each addition until only a few streaks of meringue remain (err on the side of mixing slightly less rather than more to keep the cake batter billowy).

5. 5

   Scrape batter into prepared pan and, using a small offset spatula, gently spread to edges of pan, smoothing surface. Bake cake until top springs back when lightly pressed, 18–20 minutes (cake may start to shrink from sides of pan). Let cake cool in pan, 30–40 minutes.

6. 6

   Using an electric mixer on medium-high speed, beat 2 cups heavy whipping cream, 3 Tbsp. granulated sugar, 2 Tbsp. instant vanilla pudding mix, 1 tsp. Diamond Crystal or ½ tsp. Morton kosher salt, and 1 tsp. vanilla bean paste or vanilla extract in a large bowl until medium-firm peaks form, about 4 minutes. (Or, use a stand mixer fitted with the whisk attachment, about 1 minute.)

7. 7

   Run a small offset spatula along edges of pan to release cake from sides. Place a wire rack (same size as cake and rimmed baking sheet) on top of cake and flip over to invert cake onto it; remove baking sheet. Carefully peel away parchment paper (start from a long edge where it might be embedded in the cake and pull gently to ensure you don't tear cake); discard. Place a clean sheet of parchment on top of cake and flip cake over so wire rack is now on top; remove wire rack.

8. 8

   Dollop filling over surface of cake. Using spatula, smooth cream evenly over cake, working all the way to the edges. Starting from a short end and using parchment as a guide, roll up cake. Transfer cake, seam side down, to a platter and chill until filling is set, at least 30 minutes and up to 4 hours.

9. 9

   Using a serrated knife, trim ¼"–½" off both ends of cake to create clean edges; discard (or consider them a snack!). Using a small fine-mesh sieve, dust top of Swiss roll with powdered sugar. Slice with serrated knife to serve.