In a small bowl, whisk together the coconut aminos, rice vinegar, tomato paste, honey, minced ginger, and minced garlic to create the sauce.
Dice the chicken breast into one-inch cubes and season evenly with sea salt and black pepper.
Heat the avocado oil in a large skillet over medium-high heat until shimmering.
Add the chicken to the skillet and sauté until golden brown and cooked through, approximately 6 minutes.
Remove the cooked chicken from the skillet and set it aside on a plate.
Add the bell peppers, red onion, and pineapple chunks to the same skillet, sautéing for 4 minutes until the vegetables are tender yet crisp.
Return the chicken to the skillet and pour the prepared sauce over the mixture.
Stir constantly for 2 minutes until the sauce reduces and coats the chicken and vegetables in a glossy glaze.
Steam the cauliflower rice in a separate pan or microwave until tender and hot.
Divide the cauliflower rice into bowls and top with the sweet and sour chicken mixture.