Boil water in a deep pan. Take it off the heat and add mint leaves, ginger, black peppercorns, and lemongrass. Take enough of each ingredient so that it lends its flavour. The quantity of each ingredient can be adjusted according to taste. Cover and let the mixture infuse for 5 minutes. Strain into glasses and serve. This infusion can be made in a large quantity and kept in the refrigerator for 3 or 4 days, to have to hand, when required.
Serves 2