This post includes some of the traditional foods eaten in Catalonia, and some of the traditions such as the "Tió" and "el Pessebre".
Galets de nadal
Sole fish and shrimps
El caganer del pessebre
Some snacks. (fuet, cheese, olives, chips, shellfish)
Pre-drinks and food preparing
Check out also this post about some nice places nearby my hometown.