Thong yip is one of the traditional egg yolk-based Thai desserts that have the word thong in their name, which means gold, symbolizing prosperity, increased wealth, and success. This golden-colored dessert is typically made with duck and chicken egg yolks, sugar, and jasmine-flavored water, and it is usually shaped into a flower or a five-point star.

The delicately shaped dessert is then transferred to a small porcelain cup to chill and become firm before serving. Sometimes referred to as sweet egg yolk cups, these desserts are commonly prepared for weddings and other celebrations with the intent to bring good luck, prosperity, and wealth.