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Heat half the oil in a small pan, add the onion and chorizo, and cook over a low heat until the oil starts to be released from the sausage.
Meanwhile, tip the tomatoes, beans, avocado and spinach into a salad bowl – but keep an eye on the chorizo to ensure that it doesn’t burn.
Add the remaining oil to the pan with the vinegar, garlic and oregano, then stand back as it will sizzle quite violently. Remove from the heat, pour on top of the salad and toss well. Serve with crusty bread.