All ingredients ready? Let's begin!
For big chicken breasts, cut them horizontally in half and remove any skin or fat. Place them in between plastic wrap and pound them until even in thickness.
Season the chicken with a mix of salt and sugar. Set aside at room temperature.
Mix the ingredients for the batter in a large bowl. Set up a crumbing station.
Coat chicken with flour, shake off any excess, then coat in batter, and finish with panko. Press the breadcrumbs into the chicken to help them adhere.
Set aside and let rest at room temperature for at least 30 minutes.
Mix all the sauce ingredients together in a small bowl. Shred some cabbage. Optional: prepare any other side vegetables or fermented vegetables.
Heat oil in a large pot until it reaches 365-374°F.
Carefully place the crumbed chicken in the hot oil. Fry for 2 ½ minutes. Make sure the oil stays at around 311-329°F while cooking. Flip the cutlets and cook for another 2 ½ minutes.
Remove from the oil and rest on a wire rack or on paper towels for 3 minutes.
Slice into pieces serve with side veggies and a drizzle of tonkatsu sauce. Enjoy!