Delicious Salvadoran stuffed corn tortillas. Natural Latin cuisine. Made with nonGMO corn masa. Vegan. Gluten free. Delicious. Authentic. Please recycle. Whats a Pupusa Originating from El Salvador, a pupusa is a stuffed corn tortilla filled with delicious goodness, such as black bean sweet corn. Our tortillas are produced with organic, nonGMO corn masa and are naturally gluten free. Pupusas are traditionally served with a side of curtido cabbage slaw with vinegar and salsa roja. Find the recipe for curtido on the side panel. www.trespupusas.com.