@fribbledom I guess the gaps it leaves at the corners in the square box, makes it easier to take out the first slices.
As for pizza slicing technique; isn't square-cut a thing for Chicago style pizzas?
Personally I have to try this #monohedral disc tiling technique next time: https://www.newscientist.com/article/dn28743-mathematicians-invent-new-way-to-slice-pizza-into-exotic-shapes/
Also, #Grandiosa here in Norway sells a rectangular pizza: http://manneblogg.no/testgrandiosa-hjemmelaget-pizza/