Pre-heat the oven to 350 F.
Heat the oil in a large oven proof skillet, or Dutch oven, over medium-high heat.
Liberally salt and pepper the ribs.
Place the ribs in the skillet and sear on all sides until nicely browned, about 8 minutes.
Pour the roasted veggies/Ancho chili mixture over the ribs.
Add the bottle of beer. Gently mix with large wooden spoon.
Cover and place in the oven to braise for 90 minutes.
Remove the cover, gently stir, add more beer if getting too dry, and cook for another 45 minutes.
Remove from oven and let rest for at least 1 hour (preferably overnight in the fridge).
Skim the excess fat from the top.
Re-heat the ribs in a 350 F oven until heat through.
Using tongs, carefully remove the ribs from the vessel, and using a fork, shred the meat from the bones. Set aside.