Hammer a piece of soap into a delicacy (5,4)

I believe the answer is:

pound cake

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

'a delicacy' is the definition.
The definition and answer can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'hammer a piece of soap' is the wordplay.
'hammer' becomes 'pound' (synonyms).
'a piece of soap' becomes 'cake' (I've seen this before).
'pound'+'cake'='POUND-CAKE'

'into' is the link.

Can you help me to learn more?

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

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