Cut your chicken thighs into 1 inch bites and set aside.
In a large bowl add garlic, ginger, shoyu, sesame oil, mirin, sake, and sugar. Mix well. Add cut chicken thighs and mix again. Cover and marinate in Fridge for about 1 hour
Mix egg and cornstarch in the chicken thighs marinade. Then add the potato starch and mix making sure everything is well coated.
Heat about 1 1/2 inch oil in deep pot until ready to cook then add chicken in pieces by piece. Don't overcrowd the pot so the chicken can cook evenly. Cook about 5-7 minutes or until brown and remove from pot and drain on rack.
Serve with side of lemon wedges and wasabi mayo! Enjoy!