Heat 2 tablespoon Butter in a large pan. Once melted add 1 Onion and cook on low for 4 minutes.
Add 400 g Chopped tomatoes, 500 ml Vegetable stock, 2 tablespoon Tomato puree, and 1 pinch Sea salt and black pepper and simmer for 10 minutes.
Blend and serve with Fresh basil (optional).
Notes
It might be tempting to make this soup quicker, by not cooking the onions for as long, but letting them get golden brown does add so much flavour to the soup.
If you want to add some extra fresh flavour, then blend some fresh basil in to the soup. You will need to only add it right before blending though, for maximum flavour.
If you are making this soup for young children, then use a low salt stock.
We have used vegetarian stock to keep this soup vegetarian, however you could swap it for a really good quality chicken stock to give it a richer flavour.
If you are using a jug blender to blend this soup, then wait until it has cooled first as you could crack the jug if it is too hot.
Make this soup more indulgent by sprinkling some cooked chopped bacon on top or stirring in a little cream.
Add lots of extra flavour by drizzling some pesto on top before serving.