This is probably the root of the word, but for anyone having trouble remembering the word 'бутерброд', it sounds like 'butter-bread'.
"Сендвіч" is also common used word in Ukrainian. This word is adopted from English(?), I think, and has pretty same meaning as "бутерброд".
In my mind "бутерброд" is homemade something with bread and "сендвіч" is fast food something.
Why not using канапка,
Why can't we say один бутерброд?