I am happy that it was helpful. To those not in Germany/EU or someone who cooks often the slicer is basically a mandolin. I have a personal "fear" of those things because I want to keep my fingertips but they do work damn well if you want about anything thinly sliced (including part of your hand, quickly, without warning). I have "cut proof gloves" specifically for that reason.
For a future experiment I was reading up on it since you pinged me on this earlier. You could possibly replace the starch wash step with a par-boil with a small amount of white vinegar (like 2 tablespoons to 2 quarts of water).
Cook them for ~3 min, drain and spread them out to dry for around 5 minutes (drying rack over a pan, paper towel, etc). After they are "mostly dry-ish" then cook like you already did but make sure to flip them. You can use a strainer/spoon with holes/slots/chopsitcks if you are quick and fancy... Tongs, etc..
That might allow you to skip the 2nd fry step but it still adds extra time/effort. I would also do as others suggested and look for a potato that is more suited for it. Not all potatoes are equal. If you want to try something a little fun, go get some of the multi-color "fingerling" potatoes (purple, gold, orange, etc) and try the same thing with them. It will really show you how much the type of potato matters.
I say all of this not doing it much at all myself. I just like to mess around with things sometimes and one year we did a bunch of stuff where I was cooking/frying a lot of potatoes in various ways (mostly in fry format for chili.. Damn, its gotten cold-ish, I think I will be doing that soon again, I really do love some good chili cheese fries with a proper 3-bean red chili).
My current amusement is popcorn. I am trying to do a more "healthy" at home "movie theater style" popcorn that is not overly hard to make. Ill post about it this winter as we start making it more since it's getting cold out and its the time of the year we don't go outside as much.
Oh, I assume you went to a local butcher for the tallow? If not, I would spend the effort to find one. We do that when the local place has it. Otherwise we use this https://www.southchicagopacking.com/products/wagyu-beef-tallow I don't know if they ship internationally though.
TIL they're called mandolin slicers. Here's the one we use: https://www.bornerkitchentools.com/en/collections/all/slicer Yeah, you've got to respect sharp blades, thankfully I never had a huge accident with mine... so far :)
I might try the par-boiling step in the future, although I also like to keep things a simple as possible, we'll see. In any case, thanks for the hint.
posted a link to a video that removes some of the ambiguity in choosing the right spud and good process parameters.: https://www.youtube.com/watch?v=504iV6_BCRE
Yes, I sourced the tallow at a local butcher, thank God these are still around, even with meat prices skyrocketing. Thank you for the link although I'll probably look for a source in Europe or here in Germany. It's sold for cooking and for skin care. Damn, those prices are high.
Good luck with your popcorn project, I'm sure you'll find something in time for the snowy days. The only time I made some is in one of those mini hot-air popcorn ...poppers. Last time I used that thing, I roasted coffee beans in it. Worked surprisingly well but not worth the effort for me.
Yeah, I have been using one of those little hot air things for a while but it's just not great. The popcorn is not "crispy" enough for what I prefer. I also have about a dozen different types of popping corn, all non-gmo, various breeds, sizes, etc.. When you look into something as simple as popping corn you figure out very quickly it is not even slightly simple o.0.
In the USA we have very different "chips" than in Europe so you do you. I am just happy that I could help some. Here, Russet potato's are popular for a lot of things, including chips.