In Santiago, December means cola de mono: bottles of cold, coffee-coloured spiced milk that families make days ahead and open on Christmas Eve and New Year's Eve, poured beside slices of pan de pascua, the dense Chilean fruit cake. The traditional version is for adults only, spiked with grape aguardiente; pour small glasses and drink responsibly. It tastes like a sweet, cold café con leche with cinnamon, clove and orange, the aguardiente adding a warm finish, and the texture is smooth and light, never thick. Each glass has about as much caffeine as a small, weak coffee, so use decaf for anyone sensitive. The classic mistake is adding the aguardiente while the milk is still hot: much of the alcohol steams away and the milk can catch and curdle. Let the spiced milk cool completely first. It is ready when the colour is an even tan, the spices smell strong but the milk tastes clean, and it is fridge-cold. It keeps 3–4 days in the fridge in clean bottles; shake before pouring and throw it out if it smells sour. Chef's tip: make it two days ahead; the spices keep blooming and it tastes noticeably rounder.