01 - Preheat the oven to 400°F or set an air fryer to 375°F. Line a baking sheet with parchment paper if using the oven method.
02 - Pat the tofu cubes thoroughly dry with paper towels. In a mixing bowl, gently toss the cubes with cornstarch, soy sauce, and sriracha until evenly coated.
03 - Arrange the seasoned tofu on the prepared baking sheet or air fryer tray in a single layer. Drizzle with neutral oil. Bake for 20 to 25 minutes, flipping halfway through, until the tofu is golden brown and crispy on all sides.
04 - If not using pre-cooked grains, prepare brown rice, quinoa, or farro according to package directions. Fluff with a fork and set aside, keeping warm.
05 - Julienne the carrot, thinly slice the cucumber and red bell pepper, shred the red cabbage, and slice the scallions. Arrange all vegetables and toppings within easy reach for assembly.
06 - In a small bowl, combine soy sauce, rice vinegar, maple syrup or agave, toasted sesame oil, and sriracha. Whisk until smooth and well blended. Taste and adjust heat level as desired.
07 - Divide the warm grains among four bowls. Arrange the prepared vegetables over the grains and top generously with the hot crispy tofu. Drizzle with the spicy sauce, scatter sesame seeds and fresh herbs on top, and serve immediately with lime wedges on the side.