01 - Combine soy sauce, sake, mirin, grated ginger, garlic, and sesame oil in a mixing bowl. Add chicken and toss to coat. Cover and marinate in the refrigerator for at least 15 minutes, or up to 1 hour for more flavor.
02 - In a shallow dish, whisk together potato starch and all-purpose flour until evenly blended.
03 - Fill a deep frying pan or electric fryer with vegetable oil, ensuring enough depth to submerge the chicken. Heat oil to 340°F.
04 - Remove chicken pieces from the marinade, allowing excess liquid to drip off. Dredge each piece in the starch-flour mixture, pressing lightly to adhere and shake off any excess.
05 - Carefully fry coated chicken in batches for 4 to 5 minutes per batch, or until evenly golden and crisp. Transfer to a wire rack or a plate lined with paper towels to drain excess oil.
06 - In a small saucepan over low heat, combine sweet chili sauce, soy sauce, honey, and rice vinegar. Stir until the glaze is slightly thickened, about 1 to 2 minutes.
07 - Place the fried chicken into a large bowl. Pour the warm glaze over the chicken and toss gently until each piece is well coated. Sprinkle with sesame seeds and green onions if using.
08 - Transfer glazed chicken bites to a platter and garnish with lemon wedges. Serve immediately while hot.