Spain's hamburger restaurants saw a 3.1 percent growth last year to take an even larger bite of Spain's fast food industry, reported El Mundo newspaper on Tuesday.
Meanwhile, pizza establishments saw slimmer pickings in the year just gone.
Their market share fell for the fifth year in a row, registering a drop of 3 percent, according to a study by consulting agency DBK.
Some 35 pizza restaurants shut their doors in 2012 said the consultancy.
The fast food sector in Spain fared quite well in general last year, raking in €2.73 billion last year, or 1.3 percent more than 2011.
This is, however, a drop in the speed of growth on previous years as demand fell.
But fast food remains one of Spanish gastronomy's most dynamic sectors, said El Mundo.
A large number of new fast food restaurants opened in 2012 and many more are predicted for 2013 and 2014.
Spain's hamburger restaurant currently includes 1,065 restaurants and 65 new establishments opened last year.
Total earnings were 1.43 billion in 2012.
Bocadillo sales, meanwhile, are at a standstill: their sales brought in €535 million last year and 65 new restaurants opened.
The five biggest fast food chains in Spain account for around 70 percent of all sales, reported El Mundo.
The DNK study also found that almost all fast food sales are on restaurant premises.
Only 11 percent of sales, or €300 million are from deliveries, and this number has continued to fall since 2009.