You can use queso Oaxaca as a substitute. You can use corn tortillas if you wish. The fresh guacamole salsa is very easy to make, just throw all these ingredients (2 avocados, 3 tomatillos, 2 tbsp cilantro, juice of 1 lemon, 1 jalapeño pepper, 1 serrano pepper, 2 garlic cloves, 1/4 sweet onion, salt and pepper to taste) in a blender and blend until smooth. Makes sure to remove the husks from the tomatillos, the seeds from the avocados.
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