Dice the chicken breast into bite-sized pieces and season with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, and arrowroot powder to create the sauce.
Heat the toasted sesame oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and cook until golden brown and cooked through, about 5-7 minutes, then remove and set aside.
In the same skillet, sauté the sliced red bell pepper, red onion, minced garlic, and grated ginger until the vegetables are tender-crisp.
Stir in the pineapple chunks and return the chicken to the pan.
Pour the sauce over the mixture and stir constantly for 1-2 minutes until the glaze thickens and coats everything evenly.
Serve the stir-fry immediately over the warm cooked brown rice.