Pound the chicken to an even thickness and season both sides with salt and black pepper.
Place flour, beaten eggs, and panko breadcrumbs in three separate shallow bowls.
Dredge each chicken piece in flour, dip into the eggs, then press into panko breadcrumbs until fully coated.
Heat vegetable oil in a deep skillet to 170–175 °C (340–350 °F).
Fry the breaded chicken for 3–4 minutes per side until golden brown and cooked through.
Transfer fried chicken to a wire rack or paper towels to drain excess oil, then slice into strips before serving.
In a saucepan, heat oil over medium heat and sauté onion for 5–6 minutes until soft and lightly caramelized.
Add garlic and ginger and cook for 30 seconds until fragrant.
Pour in chicken broth and bring to a simmer.
Stir in curry roux or curry paste until fully dissolved and add soy sauce and honey.
Simmer the curry sauce for 5–10 minutes until thick and glossy.
Serve cooked rice topped with sliced chicken katsu and warm curry sauce; garnish as desired.