Cut the chicken breast into bite-sized cubes and season with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, rice vinegar, tomato paste, and arrowroot powder to create the sauce.
Heat the olive oil in a large skillet over medium-high heat.
Add the chicken to the skillet and sear until golden brown and cooked through, then remove and set aside.
In the same skillet, add the diced onion, bell peppers, minced garlic, and grated ginger, sautéing until the vegetables are crisp-tender.
Add the pineapple chunks to the skillet and cook for 1-2 minutes until slightly caramelized.
Return the chicken to the skillet and pour the sauce over the mixture.
Toss everything together for 1-2 minutes until the sauce thickens and coats the chicken and vegetables beautifully.