What nutmeg grater has done for breakfast item (7,3)

I believe the answer is:

poached egg

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'breakfast item' is the definition.
'poached egg' can be an answer for 'breakfast' (I've seen this before). I'm not certain of the 'item' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for poached egg that I've seen before include "Shelled food item cooked in boiling water" , "bit of food" , "snack" , "Cooked breakfast (stolen?)" .)

I've seen this clue in The Independent.

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