5 red tea bags, such as Celestial Seasonings Red Zinger
2 tablespoons pure cane sugar, agave or honey (or more if you prefer your tea drinks a bit sweeter)
One 10-ounce bag frozen mixed berries, thawed
1/4 cup nonfat Greek yogurt
Put 4 cups cold water in a medium saucepan and bring to a boil over high heat. Add the tea bags, remove from the heat and let steep 5 minutes. Add in the sugar while it is still warm so that it will dissolve. Refrigerate until cold, at least 30 minutes.
Put the cold tea, berries, yogurt and a few cups of ice in a blender and blend until smooth. Divide the drink among 4 tall glasses.