Cut the chicken breast into 1-inch cubes and season evenly with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, rice vinegar, tomato paste, honey, and arrowroot powder until smooth.
Heat the olive oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté until golden brown and cooked through, approximately 6 to 8 minutes.
Remove the chicken from the pan and set aside on a plate.
In the same skillet, add the diced bell peppers and red onion, sautéing for 3 to 4 minutes until tender-crisp.
Stir in the fresh pineapple chunks and cook for an additional minute to warm them through.
Return the cooked chicken to the skillet and pour the prepared sauce over the mixture.
Toss everything together and simmer for 1 to 2 minutes until the sauce has thickened and coats the ingredients.
Garnish with sesame seeds and serve immediately.