3 tomatillos, husked and rinsed
2-3 serrano chiles (depends on how hot you like it)
2 garlic cloves
2 avocados, pitted and peeled
1/2 cup yellow onion
3 tablespoons cilantro
1 tsp sea salt
Put the tomatillos and chiles into a small saucepan, pour water just to cover, and bring to a boil for 5 minutes.
Remove from the heat. Do not drain the water.
Put the tomatillos, chiles and garlic into a food processor or blender and process until combined.
Add the avocado, onion, cilantro and salt and process again until smooth.
Add about a 1/4 cup of the reserved water and blend until you like the consistency. Add more water as needed.