Writing and Erasing - Edible Sheet on Shabbat
Question
Answer
Shalom and blessings
A.
For Sephardim - it is permissible to cut and eat as usual.
For Ashkenazim - this is not similar to a biscuit or cake that has letters engraved on it, or that is itself in the shape of a letter. Here, where the writing is on the cake, it is more severe.
According to the law. If the cake was cut before Shabbat and the slices were separated, it is permissible to eat on Shabbat.
If it was cut before Shabbat but the slices were not separated, an adult is forbidden to remove a slice, but it is permissible to ask a child to remove it for him.
If each slice has a complete picture or letter, it is permissible to separate the slice and eat on Shabbat. [According to the Chazon Ish, the permission is only if the entire letter or picture is eaten at once].
B. Forbidden.
C. Permissible.
Source
Magen Avraham, Siman 340, S"K 6:
And it is written there that it is only when letters are written on cakes from another material, but when the writing is from the cake itself by mold or by hand, it is permitted, and therefore they eat cakes with images. End quote, and this requires study:
And see there also S"K 10:
From Gittin, page 20, it implies that if silver letters are inserted on a garment, it is considered writing, and therefore it may be forbidden to do so on Shabbat