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Related to zwieback: zwieback toast
zwie·back(swē′băk′, -bäk′, swī′-, zwē′-, zwī′-)
A usually sweetened bread first baked as a loaf and later cut into slices and toasted.
zwieback(ˈzwaɪˌbæk; ˈzwiː-; German ˈtsviːbak)
(Cookery) a small type of rusk, which has been baked first as a loaf, then sliced and toasted, usually bought ready-made
zwie•back(ˈzwaɪˌbæk, -ˌbɑk, ˈzwi-, ˈswaɪ-, ˈswi-)
an egg bread, often sweetened, that is baked, sliced and dried, then baked again until crisp.