If you feel this way you might consider a homemade, edible present which demonstrates you have taken time and care to make something special.
I don’t want to use them to cook with as that seems rude, so I have a shelf full of bottles of wine which lovely people have given me that I have never got around to consuming.
My student told me that, in his culture, it was a sign of respect for your teacher if you give them a ‘permanent’ kind of present.
It was his way of telling me I had made a difference and I was touched.
The little plate has sat on my bookshelf ever since and is often a subject of discussion when colleagues visit me.
Last year at this time I did a post on what to buy a Ph D student for Christmas, so I thought I’d continue the tradition this year with one on gifts for supervisors.