1 onion
chopped
1 (6 ounce) can sliced black olives
½ cup white vinegar
divided
1 tablespoon vegetable oil
½ pound chorizo or bulk spicy pork sausage
12 (7 inch) corn tortillas
cut into 1-inch pieces
¼ cup vegetable oil
1 ½ tablespoons all-purpose flour
3 (8 ounce) cans tomato sauce
1 (7.75 ounce) can Mexican style hot tomato sauce (such as El Pato Salsa de Chile Fresco®)
1 cup water
1 ½ teaspoons unsweetened cocoa powder
1 teaspoon white sugar
1 tablespoon white vinegar
1 tablespoon dried oregano
1 tablespoon taco seasoning mix
1 (4 ounce) can diced green chiles
drained
¾ cup crumbled cotija or feta cheese