May one “write” happy Birthday on a cake on Shabbos forming the letters with sour sticks?


No. Although this form of writing is clearly temporary in nature, it is nonetheless prohibited on Shabbos.

Sources: See Shulchan Aruch 340:4 and Mishnah Berurah. See also Be’er Moshe, vol. 6, no. 92, discussing letters written in cream, which he writes may not be broken on Shabbos.

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