Title: Frivolous Indulgence
You couldn't get them in Wizarding shops any more. Not since that meddlesome Weasley boy—Percy—had taken a job with the Ministry.
Severus thought it a shame, because whilst he'd been at school, Percy had held the distinction of been the only tolerable member of the entire Weasley family. Now he was responsible for the trade legislation that covered foreign and Muggle imports. Responsible for all but robbing Severus of his one frivolous indulgence. Jaffa Cakes.
Now he had to resort to donning Muggle clothing once a year (on his birthday), slipping out of Hogwart's and Apparating to the nearest Muggle village. Why? Because no one could agree about whether a Jaffa Cake was, in fact, a cake, a sweet or a ruddy biscuit!
What Snape never got for his birthday: Jaffa Cakes.