You'll need to do this first part at least 3 hours before you want to eat, or you could do it the day before if you'd like.
Bake potatoes in the oven until you poke a fork in them and it goes in easily, about an hour on 350*. Let cool at least 2 hours so you can safely handle them.
Using your hands, tear potatoes into bite-sized pieces (leaving skin on) and set on a cookie sheet.
Heat your fat to 375*. I use my favorite pan for this. (We use this thing several times a week!) Drop a few potato pieces at a time into the fat and cook until golden brown. Remove with a slotted spoon and place on a baking rack over another cookie sheet to catch any fat that drips off.
Sprinkle with sea salt. Serve with aioli.
If you're not serving these with the aioli, try adding some shredded parmesan on top as soon as they come out of the fat so it'll melt and be all dreamy!