In a large bowl, combine the masa harina (corn flour) and salt. Gradually add the lukewarm water, kneading until you have a soft, pliable dough.
Let the dough rest for 10 minutes to make it easier to shape.
Mash the black beans with a fork or blend with a little olive oil until smooth and creamy.
In a small bowl, mix together the grated mozzarella and cheddar cheese.
Divide the dough into 8 equal portions, then roll them into balls.
Flatten each ball into palm-sized discs. Place a spoonful of bean puree and a portion of grated cheese in the center of each disc.
Carefully fold the edges over the filling to enclose it, reshaping into balls. Then, gently flatten them again to form disc-shaped patties.
In a hot skillet or griddle over medium heat, cook the pupusas for 3-4 minutes on each side, until golden brown and slightly crispy.
Serve hot with curtido (fermented cabbage slaw) and salsa roja (tomato sauce).
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