What's the best thing to use to make the yummiest french fries? Coconut oil? Lard? What?

For me is Peanut oil since it resists to high temperatures. try dress them with cognac... a cheap one works fine. YUMMY

Lard is the absolute best, peanut oil next. Make sure the grease is hot when you put in the potatoes. Let them set in cold water as you're cutting them up...then drain and fry!

Duck fat. Seriously. Hard to find; but what a flavor.

If you mean commercially available, easy to find and inexpensive, then you're talking about peanut oil.

old style MacDonalds were done in beef fat - goose fat is to die for, but hard to come by. I think lard makes the best fries and is easily available.

sunflower oil if you can find it in a store. or do like the canadians. french fries topped with gravy with shredded cheese melted all over.

olive oil is not suitable for deep frying.

it is best to use vegetable oil such as sunflower seed oil.

vegetable oil.