Tacos de Jocoqui al Horno Recipe - Authentic Mexican Dish

Ingredients

• 12 corn tortillas
• 2 tbsp oil
• 1 small onion, chopped
• 1 can (size #2.5) tomatoes, chopped
• 1 tsp oregano, rubbed between palms of hands
• 2 or more tablespoons salsa jalapeno or your favorite chile relish
• salt
• 1 lb (454 g) jack cheese, cubed
• 1 pt (473 ml) sour cream, salted