Starbucks makes the drink with Teavana Iced Passion Tango Iced Tea concentrate.
But, this isn't sold anywhere so the next closest is Tazo's Passion Tea.
Don't use the Tazo Iced Passion Tango Tea concentrate sold in stores.
The concentrate is a dull brownish-red color instead of vibrant red, tasted watered down, and cloyingly sweet.