To the pot add the oil and heat up, then add the onion and garlic and cook over a medium heat for 3 minutes stirring often.
Add the zucchini and continue cooking over a medium heat to soften a little (for about 5 minutes), stirring often.
Pour in the stock and passata and add pepper to taste. Stir, cover and bring to the boil then lower the heat and simmer for 10 minutes stirring occasionally.
Remove from the heat and add the basil. Puree until smooth. Add a drop of water if needed to loosen the consistency, adjust the seasoning and serve.
Notes
Passata can sometimes contain added flavourings so check the information on the bottle/carton before buying.
Use hot stock – this will speed up the cooking.
Do not add any salt into the soup as it’s cooking (the stock should provide enough salt and you can always adjust the seasoning before serving).
This zucchini tomato soup has quite a thick consistency, but a drop of water added at the end can easily fix that if necessary.
Best served hot. Once cooled refrigerate leftovers for up to 3 days.