Use this salsa recipe from Reina Soler (Red Hook Food Vendors) to make her Pupusas de Queso.
In a large bowl, mix all ingredients together along with 1/2 cup water until well combined. Transfer to the jar of a blender; blend until pureed.
Transfer to a medium saucepan; bring to a boil over medium heat. Reduce heat to a simmer and cook for 10 minutes. Remove from heat and let cool. Serve warm or cold.