__ Cake; Light Sandwich Cake With Sweet Filling

Puzzle 5 of No Refrigeration Needed Pack

Question is: __ Cake; Light Sandwich Cake With Sweet Filling

and the answer is: SPONGE

Word Meaning:

SPONGE — (countable) Any of various marine invertebrates of the phylum Porifera, that have a porous skeleton often of silica.

Definitions from Wiktionary.