Where does “pastis” come from?

pastis (Old Occitan) comes from Vulgar Latin pasticium, from Vulgar Latin *pastīcius, from Latin pasta, from Ancient Greek παστά, from Ancient Greek παστός, from Ancient Greek πάσσω, from Proto-Indo-European kʷeh₁t- — to shake.

Ancestry of “pastis”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	pasticium	—
2	Vulgar Latin	*pastīcius	—
3	Latin	pasta	paste; nominative/vocative feminine singular of...
4	Ancient Greek	παστά	barley porridge
5	Ancient Greek	παστός	sprinkled with salt, salted; woman's chamber,...
6	Ancient Greek	πάσσω	I sprinkle
7	Proto-Indo-European	kʷeh₁t-	to shake

Every word from Proto-Indo-European kʷeh₁t- →Every word from Ancient Greek πάσσω →Every word from Ancient Greek παστός →