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Rustic Sweet Potato & Bean Soup

Yields1 ServingPrep Time1 hrCook Time1 hrTotal Time2 hrs

This rustic soup has a combination of white and black soya beans, made heartier with generous chunks of sweet potato and lots of vegetables. What makes it satisfyingly light and appealing are the Asian flavours of citrusy lemongrass and kaffir.

Sweet Potato & Bean Soup

Ingredients for Soya Beans
 ½ cup soya beans
 ½ cup black soya beans
 6 cups water
 1 ½ tbsp salt
Ingredients for Soup
 2 cups of cooked beans (see method above)
 4 tbsp olive oil
 2 small brown onions, chopped
 2 medium carrots, diced
 2 sticks celery, finely sliced
 5 medium sweet potato (about 250 g), diced
 1 tsp ground cumin
 1 tsp ground coriander
 1 tsp dried chilli flakes
 2 tsp molasses sugar
 2 stalks lemongrass, bruised
 2 large kaffir lime leaves
 1 tinned tomatoes (400gram)
 1 l filtered water or vegetable stock
 2 tsp salt
 1 tsp ground black pepper
 Fresh lime, chopped coriander, extra virgin olive oil and spring onion

In a five litre pot, sweat onions, carrots and celery with olive oil and salt until soft, and onion appears translucent. This will take 3 – 5 minutes.


Add chopped garlic, pepper, cumin, coriander, chilli flakes, lemongrass, kaffir lime leaves and sugar and continue to cook, stirring regularly until colour deepens.


Add tinned tomatoes, water and beans and bring to a boil.


Skim off any scum that has risen to the top, and lower heat to a simmer. Cook for a further 45 minutes before adding sweet potatoes.


Cook for another 15 minutes or until sweet potatoes are cooked through.


Optional: To thicken soup, puree a third of it and stir into the remaining soup.


Serve with lots of chopped coriander, spring onion, lime wedges and a generous drizzle of extra virgin olive oil.