Kills micro-organisms while cooking pasties, sure (11)

I believe the answer is:

pasteurises

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

'kills micro-organisms while' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'cooking pasties sure' is the wordplay.
'cooking' indicates anagramming the letters (letters cooked up into a new form).
'pasties'+'sure'='pastiessure'
'pastiessure' with letters rearranged gives 'PASTEURISES'.

Can you help me to learn more?

I've seen this clue in The Irish Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.