Chapter 35: 7-9
The Laws of Separating Challah
7. If a dough was made with eggs or other liquids categorized as "from fruits"' there are may questions concerning the separation of challah. Accordingly, while the dough is being kneaded, some water, milk, bee's honey, wine, or olive oil should be mixed into the dough. Then challah may be separated with a blessing.*
* {Based on the comments of the Misgeres Hashulchon 5, it is preferable to use water for this purpose rather than other beverages.}
8. The mitzvah of separating challah belong to the woman of the house. However, if this woman is not home and there is a possibility that the dough will spoil, a servant or another person may separate it.
9. If one forgot to separate challah on Friday [from the bread intended for the Sabbath,] in the Diaspora, it is allowed to be eaten on the Sabbath, provided a portion is left over from which challah is separated on Saturday night. This portion must be large enough that even after the challah has been separated some bread will remain, for the remaining portion must be significant.
If the day before Pesach was Sabbath and one forgot to separate challah from the bread baked for the Sabbath, there is much confusion concerning the course of action to follow. Therefore, on Friday, each person should remind his family concerning the separation of challah.