Crossword Genius

Speech about the origin of hollandaise (5)

Ross

I believe the answer is:

sauce

I'm a little stuck... Click here to teach me more about this clue!

'hollandaise' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for sauce that I've seen before include "It's good for the goose and gander" , "Dressing served with food" , "(Semi)liquid flavouring" , "Food accompaniment" , "Gravy" .)

I've seen this clue in the Sydney Morning Herald.
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