Roasted Tomatillo Avocado Salsa (Creamy and Tangy)

Ingredients

• 1 lb (450 g) tomatillos, husked, rinsed, and halved
• 1 small white onion, cut into thick wedges
• 1 poblano pepper, halved and seeded
• 1 jalapeno, halved and seeded if desired
• 3 garlic cloves, unpeeled
• 1 tablespoon olive oil
• 3/4 teaspoon kosher salt, plus more to taste
• 2 ripe avocados, pitted and scooped
• 1/2 cup packed fresh cilantro leaves and tender stems
• 3 tablespoons fresh lime juice, plus more to taste
• 1/4 teaspoon ground cumin
• 2-4 tablespoons cold water, as needed
• Tortilla chips, tacos, or grilled chicken