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Don't Take It Lightly
Clearly there is something else going on here. While there are all sorts of foods we eat either by command or by tradition on other holidays, nowhere else is a customary food associated with a formulaic device such as this.
Why don’t we just come out and ask G-d for our needs? Why are specific foods necessary to punctuate our request?
The practice is based on a Gemara and there is definitely something of import going on. In fact, the Sefas Emes cautions us not to take this custom lightly. He says that we should not simply recite the request, rather, we should implore Him with all of our hearts.
Our heartfelt plea may arouse His mercy; it should also make us more aware of how vulnerable we are and how much we depend upon Hashem’s benevolence.
Hints to Hashem
The foods we use serve as a remez, a hint. We use them as to “remind” Hashem of our physical needs. No, Hashem does not need reminding; we and our needs are constantly on His “mind.”
We know that it is our overriding task on Rosh Hashanah to enthrone Hashem. On inauguration day, we do not bother the King with our daily worries. But it is perfectly acceptable, even praiseworthy, to give a sign, a siman, that we depend on our Him for everything.
By making these requests in the form of a hint, we relegate our needs to a place of lesser importance. We state our awareness that Crowning Hashem King is what fills up the day.