Which fast-food chain markets its fries as World Famous Fries?

McDonald's markets its fries as World Famous Fries.

The slogan identifies McDonald's signature French fries, which are served worldwide in the chain's familiar red cartons. Their standardized thin shape, crisp exterior, and soft interior helped make this style of fry a global fast-food norm.

McDonald's introduced its modern fries in 1949. In the 1950s, company founder and CEO Ray Kroc emphasized strict potato quality controls, including an ideal solids range to help maintain consistent texture. Food scientists also developed industrial methods for blanching, partially frying, freezing, and later finishing the potatoes in restaurants.

The recipe and cooking oil can differ by country. In the United States, the fries historically used beef tallow; McDonald's switched to vegetable oil with beef flavoring in 1990. That change often causes confusion about whether the fries are vegetarian or vegan, since ingredients and labeling vary by market.