Chipotle Beef Tacos with Caramelized Onions (Tacos de Carne Asada Enchipotlada)

Ingredients

• "Salsa":/recipes/14593 or "hot sauce":/recipes/29073, for serving
• 12 (6-inch) warm corn tortillas
• 1 teaspoon kosher salt, plus more as needed
• 2 medium white onions, sliced ¼ inch thick
• 3 tablespoons vegetable oil
• 1 pound skirt or flank steak (skirt steak should be trimmed of fat and white silver skin)
• 1 (7-ounce) can chipotle chiles in adobo sauce

Heat the oven on its lowest setting and arrange a rack in the middle. Place the chipotles and adobo sauce in a food processor fitted with a blade attachment or a blender and process until smooth. Using a brush, lightly coat the steak with the chipotle purée (go a little heavier on the flank than ...

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