Preheat oven to 275 degrees. In a small bowl, mix together five spice, salt, pepper, cayenne, and brown sugar. Rub all over pork.
2 pound pork shoulder, 1 1/2 Tablespoons five spice powder, 1 1/2 teaspoon cayenne pepper, 2 Tablespoons brown sugar, 2 Tablespoons salt, 1/2 Tablespoon black pepper, 1/4 cup rice vinegar
Heat avocado oil over medium-high heat in dutch oven. Sear pork on all sides. Set aside.
2 Tablespoons avocado oil
Add sesame oil to dutch oven. Add garlic and ginger and cook for 1 minute or until fragrant. Add soy sauce, rice vinegar, and water. Cook for 2-3 minutes.
1 Tablespoon sesame oil, 10 cloves garlic, 3 Tablespoons minced ginger, 1/2 cup soy sauce, 3/4 cup water
Add a few onion slices to bottom of dutch oven. Return pork to pan and top with remaining onion slices. Transfer to oven and cook for about 3 hours or until tender. Shred with fork once done.
1 onion