Peel the husks off the tomatillos and rinse them. Cut them in half. Chop the onion into large chunks. Slice the serrano peppers.

Heat a large saucepan over medium heat and drizzle in a small amount of olive oil. Add the tomatillos and serrano peppers, stirring occasionally to ensure they don’t burn. Once one side is slightly charred, flip them over to cook the other side.

When the tomatillos and peppers are halfway cooked, add the chopped onion and whole garlic cloves. Stir occasionally until everything is evenly cooked. Turn off the stove and transfer the cooked ingredients to a bowl to cool.

While the cooked ingredients cool, scoop out the avocado and remove the pit. Squeeze the juice of one lime into a blender or food processor.

Add the avocado, cooked tomatillos, serrano peppers, onion, garlic, cilantro, and salt into the blender. Pour in 1 cup of water to achieve a smooth consistency. Blend until the salsa reaches your desired texture.

Once blended, taste the salsa and adjust the seasoning if needed. Serve immediately with tacos, tortilla chips, or your favorite Mexican dishes.