I've made both of these. They are pretty much the same recipe only the soup has more water/stock. My senior aunt said the tomato soup was the best she ever had.
Basically just simmer tomatoes, butter and onion.
The Simplest Tomato Sauce Ever- Marcella Hazan
https://www.food.com/recipe/the-simplest...zan-273976
Easy Three-Ingredient Tomato Soup Recipe - How to Make Homemade Tomato Soup
Basically just simmer tomatoes, butter and onion.

The Simplest Tomato Sauce Ever- Marcella Hazan
https://www.food.com/recipe/the-simplest...zan-273976
Easy Three-Ingredient Tomato Soup Recipe - How to Make Homemade Tomato Soup
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(Never let anyone tell you that you shouldn't spend them all in one place.)