Slow-cooked pulled pork carnitas - chinese grandma

Ingredients

• 4 pounds boneless pork shoulder (aka pork butt)
• 1 onion, chopped
• 1 jalapeno, deseeded, chopped
• 4 cloves garlic, minced
• 2 oranges, juiced (3/4 cup juice)
• 1 tablespoon dried oregano
• 2 teaspoons ground cumin
• 2 teaspoons salt
• 1 teaspoon black pepper
• 1 tablespoon olive oil