Simmer the peaches: In a saucepan, bring 3 cups of water to a gentle boil. Add sliced peaches and simmer for 5–7 minutes until fragrant and soft.
Steep the tea: Remove from heat, add tea bags, and let steep for 5–7 minutes. For stronger flavor, steep longer.
Sweeten and flavor: Remove tea bags and strain the peach mixture into a pitcher. Stir in honey (or maple syrup), lemon juice, and optional ginger.
Chill: Let the tea cool to room temperature, then refrigerate for at least 30 minutes.
Serve: Fill glasses with ice, pour in peach iced tea, and top with sparkling water if desired. Garnish with mint and peach slices.