Combine all the ingredients for the marinade: sriracha sauce, soy sauce, rice vinegar, water, sesame oil, ginger, garlic, salt and pepper.
Cut the tofu into bite size pieces.
Add tofu to the marinade and gently toss to evenly coat the pieces. Set aside for 15~30 minutes.
Preheat the oven to 350°F. Line a baking sheet with parchment paper.
Using a slotted spoon, transfer tofu onto the parchment paper. Sprinkle corn starch all over and toss gently to coat. Spread tofu in a single layer and bake for 20~30 minutes, stirring every 10 minutes to bake evenly.
Remove baked tofu from the oven and let cool.