Prepare the strawberry syrup by combining sliced strawberries with ½ cup water and sugar in a medium saucepan. Bring to a gentle simmer over medium heat, then reduce heat to low and cook for about 5 minutes until strawberries soften and release their color.
Mash the strawberries with a wooden spoon against the side of the pan to extract maximum flavor and color. Continue to simmer for another 2-3 minutes until slightly thickened.
Remove from heat and let the strawberry mixture cool for about 10 minutes. Then strain through a fine-mesh strainer into a bowl, pressing gently to extract all the juice. Set aside the strawberry syrup.
Boil 4 cups of water in a separate pot. Once boiling, remove from heat, add the tea bags, and let steep for 5-7 minutes depending on how strong you prefer your tea.
Remove the tea bags and pour the brewed tea into a large pitcher.
Add the strawberry syrup to the tea and stir well to combine. The tea will immediately take on a beautiful reddish hue.
Pour in the remaining 1½ cups of cold water and the lemon juice. Stir thoroughly to combine all ingredients.
Refrigerate until chilled, at least 2 hours or overnight for the best flavor development.
Serve over ice in tall glasses, garnished with fresh strawberry slices and mint leaves if desired.