Among chefs in London, it's a common refrain. Ben Tish, who runs a Spanish and Italian tapas restaurant, told Bloomberg that he buys about 100 liters (26 gallons) of olive oil a week, to top grilled flatbread, mix into aioli and prepare luscious olive oil cakes. He now pays about 13 percent more, 26 pounds ($32.70) for five liters (1.3 gallons).

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And things are only going to get worse. Experts are predicting a worldwide shortage in the next couple of months, jacking up prices around the globe.

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The problem is several terrible years in the making. Erratic weather in Spain, Italy and Greece, where the bulk of the world's olive oil is produced, has decimated crops. In Italy, unseasonably hot and muggy temperatures have attracted fruit flies and bacteria, damaging groves. Farmers say their yields will be cut in half this year. In Greece, a heat wave could cost growers more than a quarter of their crop. Flooding in Spain's most fertile regions has decimated its harvest. Overall, experts say, global production is set to fall about 8 percent.

These shortages come as demand for the product has skyrocketed around the world. China has recently become enamored with the stuff, consuming nearly $200 million worth of olive each year. The country's nouveau riche see the product as a healthier alternative to other fatty oils. They import nearly 99 percent of what they use.

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With increased demand and less supply, prices are climbing. Since October, the cost of extra-virgin olive oil has jumped 30 percent in Italy, to $6.15 a kilogram. In Spain, the cost is up about 10 percent, near a seven-year high, according to the International Olive Council in Madrid. In Greece, it's 17 percent. And forecasters say the worst is yet to come.

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Brits may be particularly hard hit, paying a third more by the end of the year. It's a big extra cost, especially since the British pound is quite volatile in the wake of the Brexit vote.

So far, American consumers have been immune to the impact of the rising price of olive oil, courtesy of the strong dollar. And farmers in California have begun producing olives and pressing out oil. Their profits have jumped 10 percent in the past five years.