[prepend]

Chick-fil-a fries in peanut oil, although I bet it would be awesome if they fried in animal fats.

I expect it’s because they fry in the same oil as the chicken.

[joezydeco]

One of the reasons McDonald's fries used to be so loved was because they were fried in beef tallow. That went away in the 80s/90s, they're just not the same now.