4 whole berries, lightly crushed, such as raspberries or strawberries
2 quarts boiling water
3 tablespoons agave syrup or 2 tablespoons light honey
Lime wheels, for serving
Place the lemongrass, basil, mint, tarragon and berries in a large, heatproof bowl. Add the boiling water, cover and let stand for 1 1/2 hours. Strain the tisane into a pitcher and stir in the agave syrup. Pour into 6 ice-filled rocks glasses, garnish with the lime wheels and serve.