In a small bowl, whisk together the coconut aminos, rice vinegar, tomato paste, honey, grated fresh ginger, and minced garlic to create the sauce.
Season the cubed chicken breast evenly with the sea salt and black pepper.
Heat the toasted sesame oil in a large skillet over medium-high heat until shimmering.
Add the chicken to the skillet and sear until golden brown and cooked through, approximately 5 to 7 minutes, then remove from the pan and set aside.
In the same skillet, add the sliced red bell peppers and red onion, sautéing for 3 to 4 minutes until they are crisp-tender.
Stir in the fresh pineapple chunks and the prepared sauce, allowing the mixture to simmer for 2 minutes until the glaze thickens slightly.
Return the cooked chicken to the skillet and toss thoroughly to ensure every piece is coated in the glossy sauce.
Serve the sweet and sour chicken immediately over the warm, fluffy jasmine rice.