Into a hot pan, sear your chuck roast on both sides. About 3 minutes each side, no need to cook it through.
2 lbs chuck roast
Add oil into a pressure cooker, then sauté onions, garlic, and tomato paste for 1 minute.
1 onion, 5 cloves garlic, 1½ tbsp tomato paste
Add seared beef back into the pot along with beef stock.
1 L beef broth
Remove seeds from dried chilies and add them into the pot.
3 guajillo chilies, 3 chili de arbol, 3 chipotle peppers in adobo sauce
Add oregano, cinnamon, and bay leaves.
1 tbsp dried oregano, 3 bay leaves, 1 cinnamon stick
Pressure cook on high for 1 hour.
Remove meat and shred.
Remove aromatics and strain out remaining vegetables.
Blend vegetables until smooth then add them back into the broth. Keep over a simmer.
Cut your bread and spread on a layer of mayo on each slice.
1 loaf bread, 2 tbsp mayo
Place your bread, mayo side down on a low heat pan.
Add shredded cheese, beef, onions, and cilantro. Top with the second slice of bread keeping the mayo side facing up.
1 cup shredded monterey jack cheese, cilantro
Once golden brown, flip and continue cooking until cheese is fully melted.
Serve sandwich with some more of the broth as a dip.