Anko (Sweet Red Bean Paste)

Instructions

1. Soak the beans in 750 ml water for 8 hours or overnight; drain.
2. Cover with fresh water, bring to a boil, boil 5 minutes and drain to remove bitterness.
3. Return the beans to the pot with 750 ml fresh water, bring to a boil and simmer partly covered 60 to 75 minutes, topping up as needed, until soft enough to crush easily with a finger.
4. Drain off most of the water, leaving the beans just moist.
5. Add the sugar in 3 portions, stirring and letting each melt before adding the next, then add the salt.
6. Cook over low heat 15 to 20 minutes, stirring constantly, until a spatula leaves a trail and the paste thickens.
7. Stir in the oil, remove from the heat and cool; it will firm as it cools.