Looks like a press chopper. Place vegetable on top of a matrix of square blades (they’re like 10x10 rows or something) then you push through the blades with the press. It makes bulk diced veg or whatever very quickly, the blades are kind of a pain to clean but other than that, it’s pretty useful.

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I always see posts of fish and chips, and I never remember to ask:

What do you eat it with?

I prefer some hot sauce (fish) and some malt (chips)