Step 1: Place the cabbage in a large heatproof bowl and cover with boiling water for 1 minute. Drain well and return to bowl.
Step 2: Add 1/4 cup cold water along with the remaining curtido ingredients. Combine well and refrigerate, covered, for at least 2 hours. This step can be done the day before.
Step 3: Place the tomatoes, onion, clove and water in a blender container. Optional: add the serranos, if using. Blend until smooth.
Step 4: Heat the oil on medium high heat and pour the salsa into the pan. It will sputter and splash - so be careful here! Bring to a boil, stirring occasionally. Add the vinegar and bouillon powder and continue at a slow boil for about 10 minutes, or until the salsa is reduced by half. Allow the salsa to come down to room temperature.
Step 5: Prepare the pupusa dough according to the package directions using 1 teaspoon kosher salt and 2 3/4 cups of the water. Mix thoroughly to make a very soft dough, adding a little bit of water at a time if it is too dry. Let rest for about 5 minutes.
Step 6: Meanwhile, in a bowl combine the chicharron, cheese and refried beans. Set aside.
Step 7: Form dough into about 12 golf ball-sized balls and pat each one into a round about 1/3 inch thick. Place one tablespoon of the chicharron mixture in the center of each round. Fold edges of masa up around the filling and press edges together to seal. Carefully pat each pupusa between your hands to a thickness of 1/4 to 1/3 inch thick, making sure the filling doesn't start to poke through.
Step 8: Heat a cast iron griddle or large frying pan until very hot. Lightly brush griddle with canola oil (or rub an oil-soaked paper towel). Cook pupusas until browned, about 3-5 minutes per side.
Step 9: Serve pupusas with curtido and salsa at the table so everyone can garnish their own. I also like Salvadoran crema (like creme fraiche) as a topping.
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