[header] How to make pupusas [title] Make the pupusa dough. [step] Mix the masa harina, salt, and flour in a bowl. Stir it together till it forms a paste-like dough. 
It should be smooth, not lumpy. [substeps] If it's still too lumpy after stirring, add one teaspoon of water at a time and stir out the lumps till it's smooth.