Green vegetables, bangers, tins of mash (6,5)

I believe the answer is:

string beans

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

'green vegetables' is the definition.
'string beans' can be an answer for 'vegetables' (string bean is a kind of vegetable). I am unsure of the 'green' bit.

'bangers tins of mash' is the wordplay.
'of mash' is an anagram indicator (I've seen 'mashed' mean this).
'bangers'+'tins'='bangerstins'
'bangerstins' anagrammed gives 'STRING BEANS'.

Can you help me to learn more?

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

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