Grating a lemon with kedushat shevi'it
Question
Is it a problem to grate the rind of a lemon with kedushat shevi'it in order to add it to a cake (instead of discarding it in the pach shevi'it)?
Answer
Rabbi Yehuda HaLevy Amichay
You can certainly do this, but note that the entire cake will have kedushat shevi'it.