Prep: Preheat the oven to 350°F. Line the pan with parchment.
Whip Eggs: Beat eggs and sugar for 8-10 minutes until tripled in volume.
Fold Dry Ingredients: Sift flour and lemon zest gently into the foam.
Bake: 12-14 minutes until golden and springy.
Master the Roll: Immediately after baking, roll the sponge (with parchment) into a log. Cool upright.
Velvet Lemon Cream Filling: Whip cream cheese, powdered sugar, and lemon juice until smooth. Gradually add heavy cream, whipping to stiff peaks. Unroll the cooled sponge, spread filling, and re-roll.
Notes
Cracked Sponge: Roll while warm to avoid cracks.
Soggy Filling: Stabilize with cream cheese.
Bland Lemon Flavor: Double the zest for a stronger citrus punch.
Creative Twists: Add raspberry coulis for a berry swirl or a toasted coconut coating for crunch.