Dip the rim of 4 Martini glasses in a saucer of water, then into a saucer or small dish of golden caster sugar. Pop the glasses into the fridge until ready to serve.
Warm the apple juice in a small saucepan with the cinnamon stick. Bring to the boil, then turn off the heat and leave to go cold. Once cold, discard the cinnamon stick and pour into a jug.
Put the Cognac, Disaronno, Madeira wine and lemon juice into a cocktail shaker with a large handful of ice. Shake together until the mixture is chilled. Strain into your glasses, top up with the spiced apple juice and serve immediately.