Translation:What are we eating this meat with?
The "correct" way for English speakers to ask this question is "With what" are we eating this meat? This was my answer. I realize that this is not the most commonly spoken variation, but it is correct and the form most likely to be found in older literature or in formal correspondance. Regardless, "With what are we eating this meat?" is a correct answer and should not be marked as incorrect.
The website of The Chicago Manual of Style has this to say on the matter:
That old prohibition is what we call a grammar superstition. You will not find it in any authoritative grammar book. Please see CMOS 5.176.
CMOS has never prohibited a preposition at the end of a sentence in any of its versions and editions since 1906.
Serious English students: never, ever finish a sentence with a preposition such as in this case. It is an incorrect/sloppy translation by duo into English. You can easily restructure any sentence. (as many have shown here) You will be pulled up on that mistake at any legitimate university course. Also ending a sentence with a preposition not only sounds awkward but makes you come across as not very educated. HTH Cheers
Allow me to share with you the opinion of an English PhD on such matters. Beware, your mind might blow: https://forum.duolingo.com/comment/27996761$comment_id=28009320.
Or here's a source that should be more to your liking (it's largely engaged on a related campaign), except:
Although sentences 2 and 3 are not ungrammatical, we could, of course, rewrite them to avoid ending them with prepositions:
- For what do you need to go to the store?
- In which department is he?
Such wording sounds very formal, however, and would sound pretentious in casual conversation and in most professional writing. Nonetheless, in professional contexts, it is probably best to avoid ending sentences with prepositions simply because many people think that doing so is always incorrect.
So to the extent it agrees with you, it's only because a lot of grammar scolds don't actually know their grammar well.