This dish has been optimized for 4 servings. Quantity and times may need to be varied. Here you can find more information about adjusted portion sizes:
If the quantities are increased, the cooking time may be extended, so look again. Use water & spices sparingly at first and add more later if needed.
In a medium-size bowl, combine grated onion, garlic, salt and pepper. Add chicken and toss to coat well. Cover and set aside to marinate for about 1 hour.
In a large bowl, stir together the gochujang chili paste, chilli sauce, sugar, sesame seeds and lemon juice. Taste and adjust flavours to get a spicy-sweet-tangy finish. Set aside.
Pour oil into a large heavy pot to a depth of 1½ inches. Heat to 180 degrees. Combine flour and corn flour in a shallow bowl and season with salt and pepper. Tip for a super crunchy finish dip the chicken into beaten egg before you dip the chicken in the seasoned flour.
Working in batches to avoid crowding, lift chicken from marinade, dredge lightly in seasoned flour and cornflour, gently drop into oil and fry for 5 to 7 minutes, turning occasionally, until golden brown and crisp. Drain on paper towels. Repeat with remaining chicken, checking oil temperature between batches.
Drain once more on paper towels. While chicken is still hot, brush thickly with chilli sauce, extra sesame seeds and the sliced spring onions. To serve: wash and dry the lettuce leaves, and wrap a piece of chicken in the lettuce with a few of the fresh herb leaves. Then tuck in!