A simple curry paste gives this northern Thai–inspired soup surprising depth of flavor. Ingredients 6 TO 8 SERVINGS Khao Soi Paste 4 large dried New Mexico or guajillo chiles, stemmed, halved, seeded 2 medium shallots, halved 8 cloves garlic cloves 1 2" piece ginger, peeled, sliced ¼ cup chopped cilantro stems 1 tablespoon ground coriander 1 tablespoon ground turmeric 1 teaspoon curry powder Soup 2 tablespoons vegetable oil 2 14-oz. cans unsweetened coconut milk 2 cups low-sodium chicken broth 1½ lb skinless, boneless chicken thighs, halved lengthwise 1 lb Chinese egg noodles 3 tablespoons (or more) fish sauce (such as nam pla or nuoc nam) 1 tablespoon (packed) palm sugar or light brown sugar Kosher salt Sliced red onion, bean sprouts, cilantro sprigs, crispy fried onions or shallots, chili oil, and lime wedges (for serving) Preparation Ingredient info: Dried chiles are available at Latin markets; Chi...