Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Add the ground pork to the skillet and cook until browned, using a spatula to break the meat into small crumbles.
Stir in the minced garlic, grated ginger, diced water chestnuts, and shredded carrots, then sauté for 3 to 4 minutes until vegetables are slightly softened.
In a small bowl, whisk together the coconut aminos, rice vinegar, and toasted sesame oil.
Pour the sauce over the pork mixture and stir well to ensure everything is evenly coated and heated through.
Season the mixture with sea salt and black pepper to enhance the savory flavors.
Carefully separate the butter lettuce leaves and spoon the warm pork filling into each cup.
Garnish with sliced green onions before serving.