
Cut the tofu block in half lengthwise, then slice crosswise into pieces about 3/8 inch (1 cm) thick.
Heat a nonstick or well-seasoned cast-iron skillet over medium-high heat. Add 1 tablespoon of neutral oil and swirl to coat the pan.
Arrange the tofu slices in a single layer. Cook undisturbed for 5 to 7 minutes, rotating the pan as needed so the tofu browns evenly.
Flip the tofu and cook for another 5 minutes, or until the second side is golden and lightly crisp. Transfer to a serving plate.
To make the sauce, heat the remaining 1 tablespoon of oil in the same pan until hot.
Place the cilantro, scallions, minced garlic, and Sichuan chili flakes in a small heatproof bowl. Carefully pour the hot oil over the aromatics to bloom their flavor.
Add the water, light soy sauce, sugar, and rice vinegar. Stir until the sugar dissolves.
Serve the pan-fried tofu warm with the garlic chili sauce spooned over the top or on the side for dipping.