I wonder what kind of sweets they'll offer at the showcase.

Me too~

Maybe apple pie... Note how the last syllable is "i".

Or strawberry shortcake... Similarly, note how the respective first and last syllables in Japanese are "i" and "ki".

Kintsuba... Again, note the first and last syllables in Japanese! (Beginning with "ki", ending with "ba".) This is a Japanese dessert that is made of squares of sweet bean paste that then alternate between lightly battered on one side (lightly meaning it is transparent) and baked.

And bavarois (Bavarian cream)... Similarly as before, note how this begins with "ba" and ends with "a" in terms of Japanese term syllables.

Next up is A-

You made a word game out of this!? The answer is yes! After Ruby's first two choices, Kanan noticed how their Japanese terms lined up – specifically, the next item named must begin with the last syllable of the previous item. The Japanese term for this is shiritori.