Prepare rub by mixing all rub ingredients together.
Dry off short ribs with a paper towel
Pat rub on all sides of ribs
Put the ribs on a cookie cooling rack on top of a jelly roll pan, cover with saran wrap and refrigerate overnight.
The next day, heat 2-3 TB oil or bacon fat over medium-high heat. Sear the ribs on all sides, about 2 minutes each side.
Preheat oven to 300'.
Place seared ribs into an oven-proof pan and set aside.
For the Chile Braise
In blender or food processor, place onion, garlic, chile paste, tomato paste, red wine, cumin, and sugar. Process until pureed.
Wipe out the pan you used to sear the short ribs if it needs (i.e. burnt pieces) and add 1 TB oil/fat.
Add pureed chiles to oil/fat and saute for 3- 4 minutes.
Evenly distribute the puree over the top of the ribs, cover with aluminum foil snugly and bake for 3 hours, until tender and falling apart.
Remove from oven, remove aluminum foil turn oven on to broil and place ribs 6 inches from broiler for 7-8 minutes.
Pull meat off and serve with flour tortillas, cotija cheese, pickled onions, and cilantro.
It can easily be made ahead of time and reheated.
Pickled Red Onions
Place onions in a bowl.
Combine apple cider vinegar, salt, sugar, and warm water. Stir to dissolve
Pour over sliced onions, making sure they are covered
Let sit for an hour before serving
Store unused in the refrigerator for up to 1 month.