Roasted Hatch Chile Guacamole

Name: Roasted Hatch Chile Guacamole
Prep time: 20 min
Cook time: 15 min
Total time: 35 min
Cuisine: Mexican
Ingredients: 3 fresh Hatch green chiles (- see notes for substitutions); 1 ear of corn (- see notes for substitutions); 2 large avocados (or 4 small avocados, about 2 cups mashed); 3 tablespoons red onion (minced); ½ cup fresh cilantro (finely chopped); ½ teaspoon ground cumin seed; ½ teaspoon fine sea salt (plus more to taste); ½ lime (juiced, plus more to taste)