Bring 4 cups water to a boil in a medium saucepan. Add the sugar, and stir until it has dissolved. Let cool for 2 minutes. Add the tea bags, stir and let steep for 3 minutes. Remove the tea bags, and squeeze the liquid back into the pot. Transfer the tea to a container, and refrigerate until cool, about 10 minutes.
Fill 4 highball glasses, Collins glasses or 12-ounce mason jars with ice. Add 2 to 3 ounces of the whiskey and 8 ounces of the tea to each. Garnish with lemon slices and dried jasmine flowers if using.
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