01 - In a mixing bowl, toss the tempeh cubes with soy sauce, rice vinegar, and sesame oil until evenly coated. Let marinate for 10 minutes to absorb the flavors.
02 - In a separate bowl, whisk together the cornstarch, garlic powder, smoked paprika, and black pepper. Dredge the marinated tempeh cubes in the dry mixture, pressing gently to ensure an even, thorough coating on all sides.
03 - Heat the neutral oil in a large nonstick skillet over medium-high heat. Arrange the coated tempeh cubes in a single layer and fry for 2 to 3 minutes per side until deeply golden and crisp on all edges. Transfer to a plate lined with paper towels to drain.
04 - In a small saucepan, whisk together the soy sauce, maple syrup, sriracha, toasted sesame oil, rice vinegar, and sesame seeds. Set the pan over medium heat and bring the mixture to a gentle simmer.
05 - Pour in the cornstarch slurry while stirring constantly. Continue to cook and stir for 1 to 2 minutes until the glaze thickens to a glossy, syrupy consistency that coats the back of a spoon.
06 - Add the crispy tempeh nuggets directly into the saucepan with the glaze. Toss vigorously until every piece is thoroughly and evenly coated in the sticky chili-sesame mixture.
07 - Transfer the glazed nuggets to a serving platter. Scatter the sliced spring onions, toasted sesame seeds, and fresh red chili over the top. Serve immediately while hot and crisp.