In a bowl beat the egg white with the lemon juice until it starts to foam, add the peppermint, sift in the icing sugar and combine. Once the mixture gets tough, bring together with your hands and need it a little on a surface dusted with icing sugar. You can roll out the dough and cut little rounds with a cookie cutter or you can shape by hand by rolling into a little ball placing it on a lined and dusted tray and pressing down with a fork and leave them to dry out (about 2-5hrs).
In a double broiler melt the chopped up chocolate. Dunk and cover each patty in the chocolate and let set on a lined baking sheet to dry.