Thai Tea - Cha Yen in Elsewhere in Asia/Pacific: Cooking & Baking Posted July 21, 2014 It's usually made from very strongly brewed Ceylon tea and you can spice it with some Star Anise and maybe other spices. Usually the pre packaged tea you buy had yellow food coloring in it to get that color so if you make it from scratch it will look differently. You can put sugar in the tea before it starts to cool if you plan on using evaporated milk otherwise you have to use condensed milk. I sometimes combine loose Ceylon and some prepackaged thai tea and star anise and have gotten very close to what you get in Thailand. My main recommendation is to make the tea much stronger than you think and sweeter than you think.