If one has a cake with letters, words or a design on it, he may cut
through it on Shabbos provided the letters etc.. were made from
the same dough as the cake, whether the letters are sunken, flat
or protruding. However, if instead the letters etc.. are made from
icing or something other than the cake, one may then only cut in
between words, but not between letters within a word, and
certainly not into a letter. Letters made from honey or fruit juice
are of no consequence and may be cut. (MB 340:15)

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Ha Rav Leible Sternberg