I saw an image a while ago from what looked to be a comic about the Avatar: The Last Airbender series after the show. The image showed Sokka delivering peaches and other fruit to the grave of Momo and thanking him for his friendship.
I reckon it could be this illustration from "nukilik-fandom (monicapra)", if I am to believe this Reddit thread.
One of the comments there states:
As far as I can tell the artist has deleted this comic from their blog . If you know otherwise please don't hesitate to tell me.
Found with the Google Images query
sokka grave momo fruit.