Prepare the brown rice according to package directions and set aside.
In a small bowl, whisk together the tamari, honey, minced ginger, minced garlic, and arrowroot powder to create the teriyaki sauce.
Heat the sesame oil in a large skillet or wok over medium-high heat.
Season the diced chicken breast with sea salt and black pepper, then add to the skillet.
Sauté the chicken for 5-6 minutes until golden brown and cooked through.
Add the broccoli florets to the pan with a tablespoon of water, then cover with a lid for 2 minutes to steam until vibrant green.
Remove the lid and pour the teriyaki sauce over the chicken and broccoli.
Stir constantly for 1-2 minutes until the sauce thickens into a glossy glaze that coats the ingredients.
Serve the stir-fry immediately over the warm brown rice.