In a small bowl, whisk together the rice vinegar, raw honey, tomato paste, coconut aminos, and arrowroot powder until smooth to create the sauce.
Cut the chicken breast into bite-sized cubes and season evenly with sea salt and black pepper.
Heat the avocado oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sear for 4-5 minutes until golden brown and cooked through, then remove chicken from the pan and set aside.
In the same skillet, add the sliced bell peppers, minced ginger, and minced garlic, sautéing for 3 minutes until the peppers are tender-crisp.
Return the chicken to the pan along with the fresh pineapple chunks.
Pour the sauce over the mixture and toss constantly for 1-2 minutes until the glaze thickens and coats everything beautifully.
Serve the stir-fry immediately over the warm cooked brown rice.