Cannelloni bean and vegetable soup with harissa and yoghurt

So many vegetables in the garden, I think I am turning into a vegetarian.  I thought I would give this a bit of a twist, instead of making a straight forward minestrone I decided to put a bit of harissa and yoghurt in it.

Serves 4

Ingredients

300g of cannelloni beans, soaked overnight
3 carrots
1 courgette
bunch of swiss card
1 clove of garlic
1 onion
handful of green beans
1 - 2 teaspoons harissa (depending on how hot you like it)
1 tablespoon of tomato purée
1 400g tin of chopped tomatoes
1/2 teaspoon ground cumin
small sprig of rosemary
small sprig of oregano
1 bay leaf
salt and pepper

For the yoghurt sauce

4 tablespoons of yoghurt
juice of half a lemon
1 teaspoon of lemon zest
2 tablespoons chopped basil
salt

How to go about it

First cook beans in a pressure cooker for 10 minutes or 40 minutes in normal saucepan.  Drain but reserve liquid.  Peel and chop onion, garlic and carrots, chard stems, gentle fry in saucepan until soft.  Add chopped courgette and continue frying for a few minutes.  Add herbs and cumin and fry for 2 minutes.  Add harissa and purée, mix and them add tomatoes, chopped chard leaves, beans and liquid from beans and more water if you think it needs it.  Season.  Simmer for 10 minutes.

Meanwhile make yoghurt sauce by mixing all the ingredients. Serve.