HEAT teriyaki sauce ingredients - except tapioca starch and water - in a saucepan on the stove set to medium heat. Simmer for 4-5 minutes. Add the tapioca starch and water and whisk vigorously for 3-4 minutes, or until it has thickened. Set aside to cool.
ADD cooled teriyaki sauce to a large bowl and place chicken thighs in the bowl. Toss well so that the chicken is coated in the sauce and let marinate for 20 minutes (or up to overnight).
ADD ghee to a large pot on the stove, set to medium heat. Add the cauliflower rice, and season with sea salt and black pepper. Saute for 4-5 minutes, or until soft. Turn off the heat and stir in the minced scallion and cilantro.
GRILL the marinated chicken thighs on a hot grill or in a cast-iron skillet set to medium-high heat for 5-8 minutes per side.
SERVE chicken over cauliflower rice and garnish with minced scallion, sesame seeds, and fresh lime wedges.
STORE any leftovers in the fridge for up to 3 days.