Reminds me of something someone else told me.
He said he left tomato slices on a steak overnight [24hrs?]. This was a leftover steak I guess a single guy buying a two-pack of steak. Anyway, he said it was the best steak he had ever eaten.
Lemon or tomato has acid that tenderizes, I have used both making beef jerky. Of course, they will affect the flavor too to degree depending upon the method.