Crossword Genius

Falafel sandwich topper (6)

Ross

I believe the answer is:

tahini

(Other definitions for tahini that I've seen before include "Sesame seed paste" , "Sesame paste; in a hit (anag.)" , "Paste of sesame seeds" , "Sesame-seed based foodstuff" .)

I've seen this clue in the Universal.
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