Prepare the tofu: Carefully remove tofu from the package. Drain excess water. Place on a serving plate. You may pat the bottom lightly with paper towel, but don’t press—it should remain delicate and soft.
Prepare the topping: In a small bowl, mix soy sauce, chili crisp, rice vinegar, sesame oil, and sweetener (if using). Stir in minced garlic and ginger if desired.
Assemble: Spoon the sauce over the tofu block evenly. Top with diced cucumbers and scallions. Sprinkle with toasted sesame seeds.
Serve cold: Best served chilled or at room temperature. Enjoy as a side dish, light appetizer, or on top of rice.
