The Last Unicorn Games Star Trek RPG Sourcebook The Way of Kolinahr posited that Vulcan food is more delicately flavoured than human food because of the species' enhanced sense of taste. That's why Tuvok found Neelix's spiced up version of plomeek soup (VOY: "Faces") not to his liking.

I've often thought that foods from tropical climes on Earth tend to be spicy because chili peppers are anti-microbial and so it keeps food edible for longer. Similarly, salt serves a preservation function in more temperate climes. But if neither of these options are available to Vulcans because they would find the flavour too intense, then Vulcan kitchens (and pantries) might be designed to be cooler rooms just to keep food fresher for longer.

Speaking of freshness, it seems to be a necessary part of Vulcan foods. In ENT: "Home" we are told that gespar, a Vulcan fruit, may not taste good if it isn't fresh, and in this episode T'Pril complains the halak is not fresh (and salted). The emphasis on freshness may be borne out of a climate in which food spoils quicker.

Perhaps being from such a hot planet, their cuisine consists of mainly chilled dishes.

For food preservation? It's only logical.