How do I make french fries that are crispy inside and out?
I rarely bother to deep fry fries. I buy them precut, blanched and frozen in the supermarket and bake them in the oven. If I bake them as intended, they are fluffy on the inside. If I forget them in there for about double the time, they become harder and crispier throughout. 

I don't think you can imitate this with a fryer only, because you need a certain temperature there, else the fries soak up the oil. So maybe do your one-minute fry first, then put the drained fries in an oven for as long as it takes. Or just start with the convenient prepared kind and use the oven from the beginning.