1. Bring 2 cups water to a boil in a 2-qt. saucepan. Remove from heat, add tea bags, and stir in 1 cup firmly packed fresh mint leaves. Cover and steep 10 minutes. Discard tea bags and mint. Stir in 1 cup cold water, bourbon, sugar, and lemon juice, stirring until sugar dissolves. Pour mixture into paper cups; add a mint leaf and small lemon slice to each, if desired.
2. Cover each cup with aluminum foil; make a small slit in center, and insert 1 ice-cream spoon into each cup. Freeze 8 hours or until firm.