Whisk together filtered water, low-sodium soy sauce, gochujang, toasted sesame oil, rice vinegar, brown (or coconut) sugar, grated ginger, minced garlic, and arrowroot or cornstarch in a medium bowl. Set aside so flavors meld while you start cooking the chicken.
Heat sesame oil in a large skillet over medium heat. Add the white parts of scallions, red bell pepper, and garlic, seasoning with salt and pepper. After 2-3 minutes, push the vegetables aside and add the ground chicken. Break it up and cook for about 5-6 minutes until there’s no pink left.
Once the chicken is cooked, reduce the heat and pour in the sauce plus roasted cashews. Let it simmer 2-4 more minutes, stirring occasionally so the sauce thickens and flavors develop. Off the heat, stir in basil or reserve some for garnish.
Dish it up over cooked white or brown rice. Sprinkle toasted sesame seeds, scallion greens, and more torn basil for freshness and visual appeal.