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I would say 100% orange juice but that's a drink and wouldn't be counted as food. Regardless if I still have to interpret her series, a French-style dessert would fit her, since it could be made in a prestigious way, which could be decorated as a princess looking dessert if you are a very skilled chef.
But I would associate her with a strawberry, because I think that's what would fit in her tsundere-like personality. A strawberry is usually sour when unripe, eg., like acts a little bit immature when things go out of hand. But when ripe, it gets so sweet, that Iori would act so mature once she realizes her mistakes and act like a real sprouting princess filled with most of the sweet taste found in the strawberry.