Preserved Duck Egg served with cold tofu is a Traditional Taiwanese Appetizer.
The skily smooth texture of the fresh tofu pairs well with the strong flavor of the duck eggs. If you've never had this dish before, it's usually a love it or hate it type of relationship because of the eggs. Sometimes the duck eggs are also known as century eggs (likely because they've been preserved for a long time . . . hence the "century" name).
This dish is usually served with dried pork floss which is the light brown ingredient over the tofu, in addition to being drizzled with some sesame oil and oyster sauce.
Tip: You can also use egg tofu as well (instead of regular tofu).