Meanwhile, pour two cups of water in a small saucepan. Add 1 cup of fresh raspberries and 3 tablespoons granulated sugar. Bring to a boil and then reduce to a simmer for 8-10 minutes.
Allow each to cool and pour both tea and strained raspberry mixture into a large carafe. Add in mint leaves and stir to combine. With a muddler, or long handled wooden spoon, gently press on the mint leaves and twist to help bring out the oils and herbal essence.
When ready to serve, pour into clear glasses filled with ice cubes. Garnish with fresh mint leaves and raspberries in each glass. This recipe will serve 4-6 people.