Pour the boiling water over the tea bags in a small bowl, cover, and let steep 8-10 minutes. Add the sugar and stir to dissolve. Discard the tea bags and cool. Zest the lemons to obtain 4 long, curly strips. Combine the tea mixture with the lime juice in a pitcher. Divide among 4 glasses filled with ice and add 60-90 ml club soda to each glass. Garnish with star anise and lemon zest.