• Bring 8 cups of water to a boil in a large saucepan. Stir in the Thai tea powder and sugar.
• Cover and remove from the heat to steep for 15 to 30 minutes, depending on desired strength.
• Strain the tea through a fine-mesh strainer and let cool.
• Keep in an airtight container in the refrigerator for up to 2 weeks.

TO MAKE ONE DRINK:

• In a shaker, combine ice, 2 cups Thai iced tea, and 1 to 2 tablespoons condensed milk, or to taste, and shake well to blend. Serve over ice in a tall glass.