Ryomen Sukuna'a most loyal and only servant ever since the Heian era back then when they were a child Sukuna found them on the ground with their knees to the chest having ice around them and looking enigmatic and unruffled despite having this new Cursed Technique that kept freezing everyone around them after waking up even as that their parents have come to an unfortunate yet accidental death Sukuna was not someone who rejected them and instead took them in as his because he cares?

No but his ice house was destroyed by a tree and needed a replacement.

And so on Uraume learnwd how to be Sukuna's servant to cook and prepare humans which is a delicacy for Sukuna or other things which Uraume has all kinds of tools for with precision they can preserve anything, prepare anything and ofcourse serve Sukuna with polite cadence.