Ingredients
Equipment
Method
Bake the sponge
- Preheat oven to 375F and prepare a parchment-lined 10x15 jelly roll pan.
- Beat egg whites to stiff peaks, then set aside.
- Beat egg yolks with granulated sugar until smooth, then gently fold into the beaten egg whites.
- Fold in all-purpose flour and salt just until incorporated.
- Spread batter evenly in the parchment-lined pan and bake 10-12 minutes, until the sponge springs back when lightly pressed.
Roll and cool
- Turn the warm cake out onto a powdered sugar-dusted towel immediately, then peel off parchment.
- Roll up the cake in the towel while warm and cool completely to room temperature.
Fill, freeze, and slice
- Unroll the cooled cake carefully and spread rainbow sherbet in an even layer, leaving a 1-inch border.
- Re-roll tightly without the towel.
- Wrap the roll in plastic and freeze 4 hours.
- Dust with powdered sugar and slice into 1-inch rounds to serve.
Notes
For the cleanest rainbow spiral slices, keep the sponge roll tightly wrapped during freezing and slice with a sharp knife right after dusting. Store covered in the freezer up to 1 week; freezing is yes, and there’s no need to thaw—serve straight from the freezer. For a gluten-free version, use a 1:1 gluten-free all-purpose flour blend in place of the all-purpose flour.
