Finely mince the garlic cloves, grate the fresh ginger, and dice the red bell pepper and water chestnuts into small pieces.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the ground turkey to the skillet, seasoning it with the sea salt and black pepper.
Cook the turkey for 5-7 minutes, breaking it into small crumbles with a wooden spoon, until it is fully browned and no longer pink.
Stir in the minced garlic, grated ginger, diced bell pepper, and water chestnuts, sautéing for another 3 minutes until the vegetables are slightly softened and fragrant.
In a small bowl, whisk together the coconut aminos, toasted sesame oil, and rice vinegar.
Pour the sauce mixture over the turkey and vegetables, tossing well to coat everything evenly, and simmer for 1 minute.
Remove the skillet from the heat and slice the green onions thinly on a bias.
Wash and carefully pat dry the butter lettuce leaves, then spoon the warm turkey mixture into the center of each leaf.
Top with the sliced green onions and serve immediately while the turkey is hot and the lettuce is crisp.