Bring 3 cups of water to a boil. Once boiled, remove from heat and add loose leaf tea and steep for 60-75 min.
Pour through a fine-mesh sieve into a pitcher for mixing.
In a blender, add lemonade, lemon juice, add blue matcha powder and blend for a few seconds and watch it turn purple.
In a pitcher, add lavender tea, remove the foam from the blended lemonade/blue matcha mixture, then pour over the tea. Stir well.
Pour into 4 glasses and garnish each glass with a slice of lemon and a sprig of rosemary.