This truly authentic queso fundido dials it up with super stretchy chihuahua cheese that's been melted together with Mexican chorizo and roasted poblanos -- all baked and broiled to bubbly dipping perfection.
In a large saucepan, sauté the chorizo over medium heat, breaking up the sausage with a wooden spoon, until cooked through and starting to brown, about 6 minutes. Transfer chorizo to a paper towel to drain. Drain off all by 2 teaspoons chorizo fat from pan.
To the same pan, add butter. Sauté the onion and serrano pepper until softened and starting to caramelize, about 10 minutes, Add minced garlic and sauté for 1 minute.
Sprinkle mixture with flour and stir to coat, about 1 minute. Add milk and cook until thickened, about 1 minute. Add the cheese ½ cup at a time, stirring until melted before adding more.
Stir in cooked chorizo, reserving a few tablespoons. Stir in chopped poblano and spinach if using, stirring until spinach is wilted.
Transfer to an ovenproof serving dish and place in oven for 12-14 minutes. Sprinkle with reserved cheese and chorizo and increase oven to broil. Broil for 2 minutes until bubbling. Remove and garnish with pico de gallo and chopped scallions.
Serve with tortilla chips or corn chips.
Notes
* Preheat the broiler. Place poblano on a baking sheet and broil, turning occasionally until charred on all sides, about 10 minutes. Transfer to a bowl and cover with a kitchen towel and allow to steam until cool. Peel off charred skin and remove the stem and seeds.