Heat a heavy-based saucepan and fry the chorizo pieces until the fat is released.
Meanwhile, chop the onion and garlic, then thinly slice the celery and carrot. Add the vegetables to the chorizo and cook for 3-4 minutes whilst constantly stirring.
When the vegetables are tender, add the cumin powder and bay leaf, then pour in the stock. Bring to the boil
Slice the squid into rings and add to the soup. Simmer, under a lid, for 20-30 minutes.
Season with salt and pepper and sprinkle with parsley just before serving.