Final answer:
The secret of the French fry for the fast-food industry was its efficient cooking method and popularity. French fries were easy to mass-produce using machinery and freezing techniques. They became a staple menu item for fast-food chains.
Step-by-step explanation:
The secret of the French fry for the fast-food industry to end the hassle of preparing potatoes lies in its efficient cooking method and popularity. French fries were first popularized in the late 18th century in France, where they were cut into thin strips, fried twice, and sprinkled with salt. This cooking method made the fries crispy on the outside and soft on the inside, creating a delicious and addictive snack, which quickly gained popularity across Europe and eventually in the United States.
The fast-food industry adopted the French fry because it was not only delicious, but also easy to mass-produce. The fries were prepared using machinery, such as potato-peeling machines and fryers, which saved time and labor. Additionally, the fries were pre-cut and frozen, allowing them to be quickly cooked and served to customers. This streamlined process eliminated the hassle of preparing potatoes from scratch, enabling fast-food restaurants to serve large quantities of fries to meet the demands of their customers.
Furthermore, the French fry has become an iconic and staple menu item for many fast-food chains, such as McDonald's, Burger King, and Wendy's. It is not only a popular side dish, but also an integral part of combo meals and kids' meals. The French fry's universal appeal and ubiquity in fast-food menus make it an essential component of the industry's success.