Midsommarens Rulltårta
(mid-so-mah-rens rool-tor-tah)
Mormors Arv: Heritage, Midsummer, and Julbord
The grand, towering layer cakes of Swedish summer are a beautiful, tedious lie for the weeknight home cook. The real secret weapon of a resourceful mormor is the rulltårta. It delivers the same impossibly light sponge, sweet jam, and rich cream, but it bakes in exactly five minutes. The trick to a crumb that melts instantly on the palate is potato starch—a cheap, vital grocery aisle find that inhibits gluten. Roll it steaming hot in a kitchen towel to build its muscle memory without cracking, and you’ve got a foolproof slice of midsummer magic for a random Tuesday.
Before you start
Preheat the oven completely.
Set the oven to 450°F and wait. Do not start mixing the batter until the oven is holding steady at temperature; the rapid heat is critical for the sponge structure.
Prepare the baking pan.
Line a standard rimmed 15x10-inch jelly roll pan with parchment paper. Do not grease the paper.
Ingredients
- eggs3 large
- granulated sugar2/3 cup
- unbleached all-purpose flour1/2 cup
- potato starch1/4 cup
- baking powder1 tsp
- vanilla extract1 tsp
- whole milk1 tbsp
- granulated sugar2 tbsp
- high-quality strawberry preserves1/2 cup
- heavy whipping cream1 cup
- powdered sugar1 tbsp
- fresh strawberries1 cup
Method
- 01
Whip the eggs and sugar to the ribbon stage.
Beat the eggs and two-thirds cup of granulated sugar on medium-high for four to five minutes until pale, thick, and incredibly fluffy. When you lift the beaters, the batter should fall in a ribbon that sits on the surface for a few seconds before dissolving.
- 02
Whisk and sift the dry ingredients.
In a separate bowl, whisk together the all-purpose flour, potato starch, and baking powder, then sift this dry mixture directly over the whipped eggs.
- 03
Gently fold the batter with the vanilla and milk.
Add the vanilla extract and milk, then use a rubber spatula to fold the batter with wide, scooping motions from the bottom of the bowl to the top. Stop exactly when no dry streaks of flour remain so you do not deflate the eggs.
- 04
Flash-bake the sponge for five to seven minutes.
Pour the batter onto the prepared pan, spreading it gently to the corners with an offset spatula. Bake in the center of the oven until the top is lightly golden and springs back instantly when touched.
- 05
Invert the hot cake onto sugared parchment.
While the cake bakes, sprinkle a second parchment sheet generously with the extra granulated sugar. The second the cake comes out of the oven, flip the pan upside down onto the sugared parchment and lift the hot pan away. Gently peel the baked parchment off the cake; if it sticks, lightly brush the back of the stuck paper with cold water to steam it free.
- 06
Roll the steaming cake in a kitchen towel to set its memory.
Place a clean, dry kitchen towel over the hot cake. Starting from the short end, roll the cake up tightly along with the sugared parchment and the towel, leaving it on a wire rack until completely cool.
- 07
Whip the cream and prep the berries.
While the cake cools, beat the heavy cream and powdered sugar until stiff peaks form, then gently fold in the finely diced strawberries.
- 08
Unroll, fill, and re-roll the cooled cake.
Once completely cool to the touch, gently unroll the cake. Spread a thin, even layer of strawberry preserves, leaving a one-inch border at the far end, then spread the strawberry whipped cream over the jam. Use the bottom parchment paper to help guide you as you roll the cake back up, this time leaving the paper behind.
- 09
Chill briefly before slicing.
Place the roll seam-side down on a platter and chill for twenty minutes to let the cream set, then slice into one-inch rounds.
Notes
Do not swap the potato starch.
While English-language recipes often suggest cornstarch, potato starch has a larger granule size and lower gelatinization temperature. It is the definitive secret for the soft, bouncing crumb authentic to Swedish baking.
Troubleshoot crispy edges immediately.
If your oven runs hot and dries out the edges of the sponge, use a sharp knife to trim a quarter-inch off the dry ends before attempting your hot roll to prevent structural cracking.
Embrace the stubbe salvage.
If the cake cracks despite your best efforts, simply cover the entire exterior in a thin layer of whipped cream. In Sweden, this transforms it into a stubbe (log cake), which is equally traditional and hides all sins.