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 let the syrup cool completely.
02 - Place the tea bags in a heatproof pitcher and pour the boiling water over them. Steep for 5 minutes, then remove and discard the tea bags. Allow the brewed tea to cool to room temperature.
03 - Add the freshly squeezed lemon juice and honey or agave syrup to the cooled tea. Pour in the prepared fruit syrup and stir thoroughly until fully blended. Taste and adjust sweetness or acidity as desired.
04 - Transfer the combined mixture to the refrigerator and chill for at least 1 hour, or until thoroughly cold.
05 - Fill serving glasses with ice cubes and pour the chilled tea lemonade over the ice. Garnish each glass with fresh raspberries, peach slices, and mint leaves if desired. Serve immediately.