Where does “Taart” come from?

Taart (Luxembourgish) comes from Old French tarte, from Old French tourte, from Late Latin torta, from Latin torta panis, from Latin tortus, from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Taart (Luxembourgish): tart, pie