Step 1

Cut the add chuck roast into chunks that are no larger than 4 inches wide. Heat the Instant Pot on Saute mode with the oil. When the oil is extremely hot, place pieces of the roast in the pot allowing room in between each piece of meat (you may have to brown the meat in batches to avoid over crowding). Allow the meat to sear to a nice brown by cooking for about 5 minutes per side, flipping only once. Transfer browned meat to a separate plate and continue untiil all the meat is browned.

Step 2

With the meat removed but the Instant Pot still set to saute mode, add the onion. Stir a few times while scraping the bottom of the pot to release any meat that stuck to the bottom. Allow onions to brown slightly.

Step 3

Add the remaining barbacoa ingredients to the Instant Pot, along with the browned pieces of roast and any juices that may have accumulated on the plate. Stir to combine. Close lid with pressure valve seated correctly. Set to high pressure for 60 minutes.

Step 4

When the Barbacoa beef is done cooking, allow the pressure to naturally release. Then remove the meat from the pressure cooker and transfer it from a cutting board. Set the Instant Pot back to saute mode and allow the liquid to cook with the lid off so that the sauce reduces and thickens. This may take 10-15 minutes. Stir occasionally to prevent anything from sticking to the bottom of the pan. Once the meat is cool enough to handle, shred the meat and discard any fat and bone. Add the shredded beef back to the pot with the sauce, stir, and turn the Instant Pot off.

Step 5

While beef is cooking, prepare the pickled radishes by combining radishes, jalapeno, red onion, lime juice, salt and cilantro in small bowl.

Step 6

Heat a griddle over medium high heat. Spray bottom side of a corn tortilla with a very thin layer of oil, and place oil side down on hot griddle. Add a sprinkle of cheese, then a small handful of the shredded Barbacoa, then more cheese, and top with a second tortilla that has been lightly brushed with oil. Cook until tortillas start to turn golden brown and cheese melts and flip once. It may take about about 3-4 minutes each side.

Step 7

Serve Barbacoa Quesadillas with pickled radishes.