Can I fry onions in a dairy pan and then use these onions in a meat food?

I want to prepare fried onions and vegetables in a dairy pan and then pour these fried vegetables into a pot of meat. Is this permitted? Is there a difference between Ashkenazim and Sephardim?

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No good

Even if the the dairy pan wasnt used for 24 hours?

That would be ok. But it would be ideal to use dairy for dairy and meat for meat.