Preheat oven to 200°C / 400°F.
Drain and pat dry tofu with a clean kitchen towel, then slice into 0.5 inch thick pieces.
Line a baking tray with parchment paper. Arrange tofu on top in a single layer. Spray both sides lightly with cooking spray, and bake for 20 minutes or until golden, flipping once halfway.
Meanwhile, make the sauce. Chop scallion and finely mince garlic. Add to a bowl along with all other sauce ingredients, and mix until combined. Set aside.
When tofu is done baking, transfer to a nonstick skillet, arranging the pieces in a single layer. Pour half of the sauce all over the tofu and let simmer over low heat for 3-4 minutes.
Flip the tofu and pour the rest of the sauce over the tofu, and let simmer for another 2-3 minutes.
Serve warm or cold with steamed rice. Enjoy!