Put the soy sauce, bean paste, sesame oil, and sugar in a small bowl. Add half the garlic and half the scallions. Mix it all together.
Carefully remove the silken tofu from the package. First, slice the plastic around the block of tofu, and then use a paring knife to separate the tofu from the sides of the box. Then turn it over onto the serving bowl. Slice the tofu crosswise into ½ inch (1.2cm) thick slices. If using, arrange the pieces of century egg around the tofu.
Drizzle the sauce over the tofu, and garnish with the rest of the garlic and scallion on top. You can also garnish with a bit of chopped cilantro and/or Thai basil. Stir everything together at the table, and enjoy!
