In a small bowl, whisk together the honey, tomato paste, rice vinegar, coconut aminos, minced fresh ginger, minced garlic, and arrowroot powder until the sauce is smooth.
Season the cubed chicken breast evenly with the sea salt and black pepper.
Heat the sesame oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet and sauté for 5-6 minutes, stirring occasionally, until the pieces are golden brown and cooked through.
Add the sliced red bell pepper and snap peas to the skillet, stir-frying for 3-4 minutes until the vegetables are vibrant and tender-crisp.
Stir in the fresh pineapple chunks and pour the prepared sweet and sour sauce over the mixture.
Simmer for 1-2 minutes, tossing constantly, until the sauce thickens into a glossy glaze that coats the chicken and vegetables beautifully.
Serve the stir-fry immediately over the warm cooked brown rice for a complete, clean-eating meal.