Many problems that arise in making egg salad, chopped liver, tuna fish, etc. (Besides the issue of LOSH).
how to work with opening different types of boxes (matzah, cereal, etc.) on Shabbos;
Bending the top of the page; putting one letter next to another; שרטט קוים באוכלים.
Is One Allowed to Use a Very Soft Brush on Shabbos?;