2 white onions, 5 shallots, 1 can aduki beans, 1 tablespoon of butter or olive oil.
This soup is RIDICULOUSLY simple. It seems impossible that something can taste so delicious without stocks, herbs, spices, seasoning or more than two ingredients... but it's true, with just onions and beans and twenty minutes, you too can have this velvety thick, satisfying soup which is packed with flavour.
1) Peel and finely slice the onions and shallots. Pop the rings from the onion slices with your fingers and add to a pan with a knob of butter, stirring only when the onions begin to brown in order for them to caramelise evenly.
2) When the onions are soft and caramelised (about 15 minutes) add the aduki beans and a cup of water. Bring to the boil and transfer to a blender to puree before serving.