In a small bowl, whisk together the tomato paste, coconut aminos, rice vinegar, honey, minced ginger, and minced garlic to create the sauce.
Cut the chicken breast into bite-sized pieces and toss in a bowl with the arrowroot powder, sea salt, and black pepper until evenly coated.
Heat the avocado oil in a large skillet or wok over medium-high heat until shimmering.
Add the chicken to the skillet in a single layer and sear for 3-4 minutes per side until the exterior is crispy and golden brown.
Remove the chicken from the pan and set aside, then add the sliced bell peppers and pineapple chunks to the same skillet.
Sauté the produce for 3 minutes until the peppers are tender-crisp and the pineapple begins to caramelize.
Return the chicken to the skillet and pour the sauce over the mixture, tossing constantly for 1-2 minutes until the sauce thickens and coats everything beautifully.