Combine the spices and salt/pepper.
Remove the meat from the fridge and dry with paper towel about 30 minutes prior to cooking.
Coat the meat in the spice mix.
Either in a skillet over high heat or the Instant Pot using the SAUTE function on NORMAL or HIGH, warm a little bit of grapeseed oil.
Sear the meat on the top/bottom sides for about 2 minutes and then the edges for about 30 seconds.
Add the meat (if not already ito the Instant Pot along with the remaining ingredients and PRESSURE COOK on HIGH for 30-35 minutes.
Allow for a natural release for 10-15 minutes before venting the pressure.
Let the meat rest for about 10 minutes before carving.
While resting the meat, add the liquid, garlic cloves, onion, and peppers to a blender (be careful to avoid the citrus rinds). Blend until a smooth sauce is achieved.
Shave the meat into thin pieces against the grain.
Serve over warmed tortillas with sour cream, guacamole, the sauce, salsa, and/or cheese.