Mix the beaten egg yolks, condensed milk, evaporated milk & vanilla together. Set aside.
Caramelize brown sugar and water by placing the two ingredients in a pan.
Turn on the stove to medium heat.
When it gets thick & becomes dark brown in color, spread the caramel evenly on the flat side of the mold (llanera or any shaped container). Wait for about 5 minutes to cool down before pouring the egg yolk mixture.
Transfer to a steamer.
Cover the molds with an aluminum foil.
Steam for 30-45 minutes. (Steaming time depends on the size of the mold or container.)