In a small bowl, whisk together the coconut aminos, rice vinegar, tomato paste, honey, arrowroot powder, minced ginger, and minced garlic until smooth.
Cut the chicken breast into bite-sized cubes and season evenly with sea salt and black pepper.
Heat the avocado oil in a large non-stick skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté until golden brown and cooked through, approximately 5 to 6 minutes.
Transfer the cooked chicken to a plate and set it aside.
In the same skillet, add the diced red bell pepper and red onion, sautéing for 3 to 4 minutes until they are tender-crisp.
Add the fresh pineapple chunks to the skillet and cook for an additional 2 minutes until they begin to caramelize slightly.
Return the chicken to the skillet and pour the prepared sauce over the chicken and vegetables.
Toss everything together and simmer for 1 to 2 minutes until the sauce thickens and coats the ingredients in a glossy glaze.
Serve the sweet and sour chicken immediately over the warm, cooked jasmine rice.