Guacamole Taquero (Tomatillo Guacamole)

Ingredients

• 8 ounces tomatillos (about 4 medium), papery husks removed, rinsed, and quartered
• 6 large fresh epazote leaves or 2 tablespoons coarsely chopped fresh cilantro
• 2 medium jalapeño peppers or serrano chiles, stemmed and coarsely chopped
• 2 medium garlic cloves, peeled and smashed
• 1/4 medium white onion, coarsely chopped
• 1 tablespoon freshly squeezed lime juice, plus more as needed
• 1 teaspoon kosher salt, plus more as needed
• 1 medium, ripe avocado, halved and pitted