The answer is one word.
I've added a "cipher" tag.
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The answer is
Because each image
resembles a letter from the maritime signal flag alphabet!
Apparently this is a chocolate and vanilla Battenberg Cake, which I have never heard of before. Looks like there is some sort of raspberry (presumably) jelly or something to glue the pieces together.
Uhh... I'm not too familiar with macaroons to begin with, but at least the little one on top appears to be a macaroon. So, what's the big ol' base and the cookie halves for? Plus, there's just ONE blueberry... And what is that black thing? Makes it look like a candle pastry!
A mango dome entremet OR a mango mousse dome? What?
Another battenberg cake, but this time white chocolate, raspberry, and vanilla (I think).
Cut/sliced mango and strawberries.
This is nifty looking. I guess it's a well done raspberry and (white) chocolate (or, maybe it's fondant, however that's actually spelled) sponge cake.
How this all relates:
Hah! No idea other than them all being forms of deserts. (Well 5 is only fruit you say. Well fruit can be considered desert, probably more commonly so outside of the states I say).
(Note, I forgot about the title. Yeah, they're deserts. Great observation.)