1. Preparation
Cut 500g of chicken thighs into bite-sized pieces.
In a large bowl, combine 4 tablespoons of soy sauce, 2 tablespoons of sake, 1 tablespoon of mirin, and 1 teaspoon of sugar.
Add the chicken pieces to the marinade, ensuring they are fully coated. Cover and refrigerate for at least 15-30 minutes.
While the chicken is marinating, prepare the coating by mixing 1 cup of potato starch with a pinch of salt in a shallow dish.
2. Cooking
Heat vegetable oil in a deep frying pan or pot to 170-180°C (340-360°F).
Remove the chicken from the marinade and allow any excess marinade to drip off.
Dredge each piece of chicken in the potato starch mixture until fully coated.
Once the oil is hot, carefully add the coated chicken pieces in batches, ensuring not to overcrowd the pan.
Fry for about 5-6 minutes or until golden brown and cooked through, turning occasionally for even cooking.
Use a slotted spoon to remove the chicken from the oil and drain on paper towels.
Serve hot with lemon wedges and a side of dipping sauce, if desired.