Chestnut Chorizo Soup

Ingredients:

4 tablespoons oil
1 large Spanish onion, diced
1 medium carrot, diced
1 celery stick, diced
1 gram 120 (4 oz) mild chorizo cut into cm cubes
2 garlic cloves, thinly sliced
1 teaspoon ground cumin
1 1/2 teaspoons chopped fresh thyme leaves (I use 1 teaspoon of dried sometimes)
2 smalls dried red chillies, crushed (I omit these because of the kids)
1 can of chopped tomatoes (or 2 roughly chopped fresh tomatoes)
500 grams (about a pound) cooked, peeled chestnuts (although you can get them fresh here, I usually use vacuum packed because I detest pee
4 tablespoons 20 saffron threads infused in 3- boiling water
1 liter (about 2 cups) of water
sea salt and pepper to taste

Course: soup