Thai iced tea recipe for that authentic restaurant taste: 1. Bring 4 cups of water to a boil and stir in 1 cup of Thai iced tea mix. 2. Once boiling, adjust sweetness by adding around 3/4 cup of sugar to taste. 3. Let it boil for an additional 10 to 15 minutes for a stronger flavor, if desired. 4. Turn off the heat and allow the mixture to cool to room temperature, then strain it. 5. Fill a glass with ice and pour the brewed Thai tea until it's about 2/3 full. 6. Add evaporated milk to your liking, and for extra sweetness, include condensed milk to taste. Enjoy!