Dice the onion and finely chop the garlic. Heat 1 tbsp of olive oil in a large skillet over medium heat. Add the onion and garlic, sautéing until the onion is soft and translucent, about 5 minutes.
Add the chorizo to the skillet, breaking it apart with a spatula. Cook for about 5 minutes until it starts releasing its oils and turns slightly crispy.
Introduce the beef to the skillet with the chorizo. Season with salt and black pepper. Continue to cook until the beef is browned and cooked through, about 8–10 minutes. Stir occasionally to ensure even cooking.
Warm the corn tortillas on a dry skillet or grill until they are pliable, about 1 minute per side.
To serve, place a generous spoonful of the beef and chorizo mixture onto each tortilla. Garnish with freshly chopped coriander and a squeeze of lime juice.