Combine the light soy sauce, sesame oil, rice vinegar, sugar, chilli oil, minced garlic, salt (if using) and a tablespoon of water in a small bowl. Mix well until the sugar dissolves. Taste and adjust seasoning if necessary.
Carefully remove the silken tofu from its packaging. Since it’s very delicate, handle it with care to avoid breaking it.
Place the tofu block on a plate or shallow dish. Drain any excess liquid that comes with silken tofu.
Make cuts in tofu so that the sauce can penetrate deep within the layers.
Pour the prepared sauce evenly over the sliced tofu. Let it sit in refrigerator for 1 – 2 hours or atleast 30 minutes.
Sprinkle the chopped scallions, cilantro, and toasted sesame seeds on top.
Serve the silken tofu chilled or at room temperature.