I would think it's paella.
Garcia is the most common surname in Spain.
The most common language spoken in Spain is Spanish.
The most common blood type in Spain is A positive. A positive is the most common blood type anywhere in the world.
Spain oraments
Paella
There is the common cold and influenza.
the most common aboriginal food is kangaroo
SEAT is the commonest car brand in Spain
The most commonly consumed food is rice.
Run of the bulls.
Bus
Chickens