Lemon Curd Consistency

Achieving the right lemon curd consistency is critical for Swiss rolls and roulades. A runny curd seeps into the sponge, creates soggy patches, and oozes out when sliced. The key is patience during cooking: stir continuously over gentle heat for 8–12 minutes until the mixture holds a visible trail and coats the back of a spoon heavily. Adding a tablespoon of cornstarch provides structural insurance, stabilizing the set without dulling the bright lemon flavor. Extra egg yolks add richness and body. Always chill the curd for at least 2 hours — ideally overnight — until it is spreadably thick and holds its shape on a spoon. If it still seems thin after cooking, return it to gentle heat and stir for a few more minutes before chilling again.