Add the sliced peaches, raspberries, granulated sugar, and water to a saucepan.
Heat over medium heat, stirring occasionally. Keep the mixture at a gentle heat without allowing it to reach a full boil.
Continue heating for 5–8 minutes, or until the sugar has completely dissolved.
Gently mash the peaches and raspberries with a fork to release their juices and deepen the fruit flavor.
Remove the saucepan from the heat and strain the syrup to remove the fruit pieces.
Allow the peach raspberry syrup to cool completely to room temperature.
To prepare your Bellini Peach Raspberry Iced Tea, add the chilled black tea and 2–4 tablespoons of syrup to a glass.
Add a generous handful of ice and stir until combined.
Serve immediately while cold and refreshing.