Prepare the brown rice according to package directions and set aside.
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, arrowroot starch, grated ginger, and minced garlic to create the sauce.
Heat the sesame oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté for 5-6 minutes until golden brown and cooked through, then remove and set aside.
In the same skillet, add the bell peppers and red onion, sautéing for 3-4 minutes until they reach a crisp-tender consistency.
Stir in the pineapple chunks and the prepared sauce mixture, cooking for 1-2 minutes until the glaze thickens and bubbles.
Return the chicken to the skillet and toss everything together to coat thoroughly in the vibrant sauce.
Serve the sweet and sour chicken immediately over the warm brown rice.