Vegan panna cotta ingredient (4)

I believe the answer is:

agar

(Other definitions for agar that I've seen before include "Medium for growth" , "Food thickening agent obtained from seaweed" , "found in the sea" , "Gelatinous substance from seaweed used as a thickener in foods." , "Seaweed derivative" .)

I've seen this clue in the LA Times.

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