Cook the brown rice according to package instructions and set aside.
In a small bowl, whisk together the coconut aminos, rice vinegar, honey, and arrowroot powder to create the sauce.
Heat the sesame oil in a large skillet or wok over medium-high heat.
Season the diced chicken breast with sea salt and black pepper, then add to the skillet and sear until golden and cooked through.
Add the sliced red bell pepper, snap peas, minced garlic, and grated ginger to the pan, sautéing for 3-4 minutes until the vegetables are tender-crisp.
Stir in the pineapple chunks and pour the sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce thickens into a glossy glaze.
Serve the sweet and sour chicken immediately over the cooked brown rice.