Sift the ground almonds and caster sugar into a bowl.
Whisk the egg white in another large bowl using an electric hand whisk, until it has stiff peaks.
Fold the ground almond and sugar mixture into the egg white, with the vanilla extract.
Put the mixture in a piping bag with a star nozzle and pipe shapes onto a lined baking tray, allowing space between them.
Bake at 180 degrees for 13-15 minutes.
Remove from the oven and brush with a mixture of two tablespoons of milk and one tablespoon of sugar. Allow to cool.