Crossword Genius

Salmon sauce with shortening lacking firmness (7)

Ross

I believe the answer is:

gravlax

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'salmon' is the definition.
(Nordic salmon dish)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for gravlax that I've seen before include "Scand. cured salmon" , "Dry-cured salmon" .)

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