Store bought lemon curd also works fine here!
*If you only have metal pans, use a double boiler with a glass bowl. If you make lemon curd in a metal pan or bowl, the acidic lemon juice can react with the metal and make your curd taste metallic.
**If you find it tasting metallic and have eliminated the contact of lemon juice with the metal pan/whisk, etc. then you're probably overheating it - take it just 170F (77C).
***This is how I do it to avoid extra dishes and I don't have any issues with the cream whipping. If you prefer, you can whip the cream separately and fold it in at the end.