What vegetable's French name translates to "earth apple" in English?

The introduction of the potato to Europe at beginning of the 17th century was not exactly love at first sight.

Initially, potatoes were admired more for their flowers than as a food source. However, in the late 18th century, a French army chemist, A.A. Parmentier, recommended potatoes as a solution for the famines that were sweeping across France and devastating the country at the time. Parmentier pointed out that, given how easy they were to grow, potatoes were an excellent food to help stave off famine. From then on, the potato became the food of the poor across Europe, and especially in Ireland.

In France they are known as apples (pommes) of the earth (de terre). In 2017 it was estimated that the average French person ate about 50 kg (110 pounds) of potatoes each year, with about half of that being in the form of processed potato products.