Albóndigas in Red Chile Sauce

In case you were wondering, albóndigas is the Spanish word for meatball. These prove that the Italians aren’t the only players in the game.
Recipe information
Yield
8 Servings
Ingredients
Albóndigas
red chile sauce and assembly
Preparation
ingredient info:
Step 1
Cotija cheese is available at Latin markets and some supermarkets.
Albóndigas
Step 2
Preheat broiler. Place poblano chile on a broiler-proof rimmed baking sheet and broil, turning occasionally, until charred in spots and blistered all over, 6–8 minutes. Transfer to a bowl, cover with plastic wrap, and let steam 10 minutes. Remove skin, stem, and seeds; discard. Pulse poblano, onion, garlic, arugula, and cilantro in a food processor until very finely chopped.
Step 3
Combine tortilla chips and milk in a large bowl; let stand until chips soften, about 5 minutes. Mix in poblano mixture, eggs, and cheese; season with salt and pepper. Gently fold in beef. Form mixture into 1½”-diameter balls (2 Tbsp. each; makes about 40) and chill at least 4 hours.
red chile sauce and assembly
Step 4
Place ancho chiles in a small bowl and add boiling water to cover. Let sit until softened, about 15 minutes. Drain chiles. Purée chiles, onion, garlic, cumin, 2 cups broth, 1 Tbsp. oil, and 1 Tbsp. sugar in a blender until smooth, adding more broth by the tablespoonful to thin sauce as needed (should be consistency of whole milk); season chile sauce with salt, pepper, and additional 1 Tbsp. sugar, if sauce is too bitter.
Step 5
Heat remaining 1 Tbsp. oil in a large nonstick skillet over medium heat. Working in batches, cook meatballs, turning occasionally, until brown all over, 8–10 minutes. Transfer meatballs to a Dutch oven or other large heavy pot and add chile sauce. Bring to a boil, reduce heat, and simmer, turning meatballs halfway through and adding more broth if needed (sauce should come up to about ¾ sides of meatballs), until meatballs are cooked through and sauce is slightly thickened, 15–20 minutes.
Step 6
Meanwhile, whisk sour cream and lime juice in a small bowl; season with salt.
Step 7
Serve meatballs with lime sour cream, Cotija cheese, radishes, pumpkin seeds, cilantro, and lime wedges.
Step 8
DO AHEAD: Red chile sauce can be made 3 days ahead. Meatballs can be formed up to 1 day ahead. Cover both separately and chill. Meatballs can be cooked in chile sauce 1 day ahead. Reheat before serving, adding chicken broth or water as needed to thin sauce.