Remove tofu from packaging and press between heavy plates for 15 minutes to extract moisture, then dice into 1-inch cubes.
Dredge the tofu cubes in cornstarch until all surfaces are lightly and evenly coated.
In a small mixing bowl, combine gochujang, soy sauce, honey, sesame oil, garlic, ginger, and water, whisking until the paste is fully emulsified.
Heat vegetable oil in a non-stick skillet over medium-high heat until shimmering.
Add tofu cubes to the skillet in a single layer and sear until golden-brown and crispy on all sides, approximately 8 to 10 minutes.
Reduce heat to medium and pour the sauce mixture over the tofu.
Toss the tofu continuously for 2 minutes or until the sauce reduces into a thick, glossy glaze that adheres to the protein.
Remove from heat and garnish with sliced scallions and toasted sesame seeds.