Ingredients
Equipment
Method
Bake the sponge
- Preheat the oven to 375F and prepare a parchment-lined 10x15 jelly roll pan for baking. Set up to work quickly so the cake can be rolled while warm.
- Beat the egg whites to stiff peaks, then fold in the yolks beaten with the sugar. Continue gently mixing so the batter stays airy.
- Fold in the all-purpose flour, salt, and vanilla extract just until no dry streaks remain. Keep the batter light for the best roll texture.
- Spread the batter in the parchment-lined 10x15 jelly roll pan and bake 10-12 minutes at 375F. Bake until the cake springs back when lightly touched.
- Turn the cake out onto a powdered sugar-dusted towel immediately. Roll it up in the towel while warm to form the correct spiral.
- Cool completely while rolled in the towel. This helps the cake hold its shape for filling.
Fill, freeze, slice
- Unroll the cake carefully and spread the rainbow sherbet in an even layer, leaving a 1-inch border. Keep the layer smooth so the center slices show clean rainbow spirals.
- Re-roll tightly without the towel, pressing gently to keep the center sealed. Wrap the cake roll in plastic to prevent freezer ice.
- Freeze for 4 hours until firm. The cold set makes slicing into 1-inch rounds neat and vivid.
- Dust with powdered sugar and slice into 1-inch rounds to serve. Serve immediately for the cleanest spiral reveal.
Notes
Pro tip: dust the towel well and roll right after baking so the sponge doesn’t crack. Store covered in the freezer up to 2 weeks; for best slices, let sit 3-5 minutes at room temperature before cutting. Not freezer-to-fridge friendly—refreezing after thawing can soften the sponge and blur the spiral. For a dairy-free swap, choose a dairy-free rainbow sherbet and proceed the same way.
