In a small bowl, whisk together the tamari, rice vinegar, honey, grated ginger, and minced garlic to create the sauce.
In a separate small ramekin, mix the arrowroot starch with water to create a slurry and set aside.
Cut the chicken breast into bite-sized pieces and season with sea salt and black pepper.
Heat the sesame 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, about 5-7 minutes.
Toss in the red bell pepper, snap peas, and pineapple chunks, stir-frying for 3-4 minutes until the vegetables are tender-bright.
Pour the sauce over the chicken and vegetables, then stir in the arrowroot slurry.
Simmer for 1 minute until the sauce thickens into a glossy glaze that coats everything beautifully.
Serve the stir-fry immediately over the warm cooked brown rice.