`borsjtschrokkende`, not `borsjtsjschrokkende`. And yes, that is `mierenneukerig` (nit-picking, literally: ant f*cking). Besides: using a word like borsjt is cheating.
As for the spelling: https://nl.wikipedia.org/wiki/Borsjtsj
(Edit: That page also mentions a soup called 'sjtsji'.)