Prepare pork shoulder by seasoning with olive oil, salt, pepper, Adobo seasoning and crushed garlic. Rub pork shoulder generously. Sear pork shoulder in large, hot pan on both sides. Add water to cover. Grab a handful of peppercorns and add them to water and bring to a boil. Reduce heat and slowly simmer for 3-5 hours or until meat starts to fall off the bone. Remove meat from water and shred.
To prepare pork for sandwiches, add olive oil to large pan. Add onion. Cook onion until translucent over medium heat. Next, add chiles and tomato sauce. Take about 4 cups of pulled pork and add them to pan and sprinkle with several dashes of chili powder. Feel free to add more tomato sauce if needed to add more moisture to the pork. Combine.
Toast sandwich buns. Add one heaping serving of pork to sandwich bun. Top with shredded lettuce, cilantro, red onion, avocado and then drizzle with Valentina hot sauce. Serve with tortilla chips and enjoy!