It is important to use only highly heatable oils. Keywords such as "high oleic" sunflower oil help. Or refined rapeseed oil. If it smokes, you have the wrong oil/fat, dispose of it! -> acrylamide.
Otherwise: in Belgium (stronghold of French fries) beef kidney fat is used.
You can see this when you order the item in the order overview or when you go to the availability display for the item. Please note that you must always order the item for collection via the online shop first.
It simply heats up to 190 degrees. Should also work with the beef fat. However, it must be liquid and no longer hot to drain into the lower container. I have no idea whether the beef fat is then too viscous.
I bought the small one first, but then it was too small - oh wonder :-). The larger one can certainly also be used with 2.5-3 litres. I recommend buying the larger one. As they are almost the same price. The larger one also has a timer.
Not officially at Tafel, but have a look at fixpart.ch - the collection container is available there (although a recession was written that it never arrived).
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I think that means this unit came back from a customer and was repackaged. Or similar. Personally, I would not buy such an item unless it was really very cheap.
Regards
Albert
I keep the oil tank on the basement shelf. I stuff some household paper into the opening, as it is usually still slightly wet with oil after the tank is removed and should not collect dust. Works wonderfully. The tank is not really airtight. Otherwise it would "collapse" after the oil has cooled down completely due to the negative pressure.