This frosting will keep for about 3 days at room temperature or in the refrigerator. In this case, let it come to room temperature and beat again to restore its smoothness.
To vary the flavour, replace the milk and vanilla:
Coffee Frosting: 250 ml (1 cup) of cold strong coffee
Lemon Frosting: 125 ml (½ cup) of lemon juice,
125 ml (½ cup) of water and 1 egg yolk
Coconut frosting : 250 ml (1 cup) of coconut milk