Egg yolks, canned condensed milk, vanilla extract, and water: That's all you need to prepare these sweet treats, plus some softened butter to grease the miniature pans and flour for dusting the same. First some of the yolks are beaten until foamy and then divided among the pans and chilled until set before being boiled in a syrup made with the remaining yolks and other ingredients for a couple of minutes. Sheer perfection.