Press and cube firm tofu, then pan-fry until golden for texture. In the same wok or skillet, stir-fry garlic, ginger, and scallions briefly, then add spinach in batches and toss until wilted. Return tofu to the pan and add a sauce of soy sauce, rice vinegar, a touch of sugar, and sesame oil.
Serve over steamed rice or noodles and top with toasted sesame seeds and chili flakes if desired.
Tips:
This dish is fast, balanced, and adaptable to pantry staples for a midweek meal.