Preheat oven to 100° C

Mix egg white, caster sugar, boiling water, vinegar/lemon juice and vanilla essence together with an electric mixer for 10 minutes till stiff

Fold in baking powder

Pour meringue mixture into icing sugar bag and push into dollops onto baking tray

Bake for 60inutes at 100°C

Switch off oven and allow meringues too cool in oven