New Delhi, May 30 -- Tomatoes, ubiquitous in everything from fast-food burgers to haute cuisine, are taking on a new role beyond the plate: A nagging reminder of rising costs.

Prices for those red orbs have soared more than any other food product over the past year to cement a spot as one of the consumer headaches du jour.

"The tomato has become a symbol of something much deeper," says Isaac Bernal Carbajo, a New York City chef who lamented life's "simplest pleasures" falling victim to price increases. "Something as basic as buying fresh vegetables is starting to become a serious financial decision for many families."

Tomato prices are up about 40% over a year ago, according to the latest Consumer Price Index, dwarfing increases for ot...