01 - In a mixing bowl, combine the soy sauce, sake, mirin, grated ginger, garlic, and sesame oil. Add the chicken pieces and toss thoroughly to coat. Allow to marinate for at least 15 minutes, or up to 1 hour for deeper flavor.
02 - In a shallow dish, blend the potato starch with the all-purpose flour until well combined.
03 - Pour enough vegetable oil into a deep frying pan or electric fryer to submerge the chicken. Heat the oil to 340°F.
04 - Remove chicken from the marinade and let any excess drip off. Dredge each piece in the starch-flour mixture so it is fully coated, shaking off the excess.
05 - Working in batches, fry the coated chicken pieces for 4 to 5 minutes until golden and crispy. Transfer the fried chicken to a wire rack or plate lined with paper towels to drain.
06 - In a small saucepan over low heat, stir together sweet chili sauce, soy sauce, honey, and rice vinegar. Warm for about 1 to 2 minutes, stirring often, until slightly thickened.
07 - Toss the freshly fried chicken in the warm glaze until evenly coated. Garnish with toasted sesame seeds and sliced green onions if desired.
08 - Arrange the glazed karaage hot on a serving plate. Provide lemon wedges on the side and serve immediately.