Oats simmered in milk with cinnamon and clove, chilled for two hours and then blended smooth. It is a cold drink served in glasses, not a bowl of porridge, and it is what Colombia means by avena.
Avena in Colombia is a cold drink, not a bowl of porridge, and that is what this recipe makes. Oats are simmered in milk, chilled for two hours and then blended smooth, and what comes out is poured into glasses. It is sold in bags on the street and drunk with breakfast or in the afternoon. Stir constantly during the first fifteen minutes. Oat flakes sink and stick, and a scorched taste goes through the whole batch. The pot needs watching more than it needs time. The two hours in the fridge are not optional and they are not just about temperature. The oats keep absorbing liquid as they cool, which is what gives the drink its body, and blending it warm gives something thin that thickens unpredictably later. It will thicken further in the fridge overnight, so keep some water or milk aside to loosen it before serving.