01 - Wrap tofu block in a clean towel, place a heavy object atop, and press for 10 to 15 minutes to remove excess moisture.
02 - Cut pressed tofu into approximately 3/4 inch (2 cm) bite-sized cubes.
03 - Whisk soy sauce, sesame oil, rice vinegar, garlic powder, and onion powder in a bowl. Add tofu cubes and gently toss to coat; let marinate for 10 minutes.
04 - Combine cornstarch, panko breadcrumbs, salt, and black pepper in a shallow bowl.
05 - Thoroughly dredge each marinated tofu cube in the cornstarch mixture, ensuring even coverage.
06 - Warm vegetable oil in a large nonstick skillet over medium-high heat.
07 - Place tofu cubes in a single layer; fry 2–3 minutes per side until golden brown and crisp, about 10 minutes total, cooking in batches if needed.
08 - Transfer tofu to paper towels to drain briefly. Serve hot with preferred dipping sauce.