Sopa Seca de Fideo With Tomatillos

Name: Sopa Seca de Fideo With Tomatillos
Ingredients: 3/4 pound tomatillos (about 6 medium-sized), husks removed; 1 to 2 serrano chiles; 1/4 medium onion; 1 clove garlic; 2 tablespoons fresh cilantro , chopped, plus extra for garnish; 4 tablespoons extra virgin olive oil , divided; 4 ounces fresh Mexican chorizo , casing removed, crumbled; 8 ounces capellini , or angel hair pasta, broken into 1- to 1 1/2-inch pieces; 1 teaspoon sea salt; Freshly ground black pepper; 2 1/2 cups chicken stock; 4 ounces goat cheese , crumbled; 1 avocado , seeded, peeled, diced; Crema fresca or sour cream , for garnish