01 - In a small saucepan, combine the raspberries, peach slices, sugar, and water. Bring to a simmer over medium heat, stirring gently until the sugar dissolves and the fruit softens, about 4 to 5 minutes. Remove from heat and strain through a fine mesh sieve into a bowl, pressing firmly to extract as much juice as possible. Discard the solids and set the syrup aside to cool completely.
02 - Place the tea bags in a heatproof pitcher and pour the boiling water over them. Allow to steep for 5 minutes, then remove and discard the tea bags. Let the brewed tea cool to room temperature.
03 - Add the cooled tea, freshly squeezed lemon juice, honey or agave syrup, and the prepared fruit syrup to a large pitcher. Stir thoroughly until all the sweetener is dissolved and the mixture is well blended. Taste and adjust sweetness or acidity as desired.
04 - Refrigerate the combined mixture for at least 1 hour, or until thoroughly chilled.
05 - Fill serving glasses generously with ice cubes. Pour the chilled tea lemonade over the ice. Garnish each glass with fresh raspberries, peach slices, and mint leaves as desired.