01 -  In a large mixing bowl, whisk together gluten-free tamari, brown sugar, minced garlic, grated ginger, sesame oil, green onions, and black pepper until well combined. 
 02 -  Add the chicken thighs to the marinade, ensuring each piece is fully coated. Cover the bowl and refrigerate for at least 4 hours or overnight for intensified flavor. 
 03 -  Heat vegetable oil in a deep fryer or heavy-bottomed pot to 350°F. 
 04 -  Remove chicken from the marinade, allowing excess liquid to drip off. Dredge each piece thoroughly in mochiko flour, shaking off any excess. 
 05 -  Carefully lower coated chicken pieces into the hot oil in small batches. Fry for 4 to 5 minutes, turning as needed, until golden brown and cooked through. 
 06 -  Remove fried chicken with a slotted spoon and place onto paper towels to drain. Serve immediately, garnished with additional green onions or sesame seeds if desired.