Maybe a can of diced tomatoes, add just a little tomato juice and throw in your own chopped onion, peppers, and seasonings
whisk in a little sugar, stock syrup or glucose, or try adding a little chopped coriander, season well sometimes things taste sour because the flavour balance is wrong, ie more salt or sugar required.
The tomatillo, which looks like a small green tomato, is the primary ingredient.
The marimba
you put it in a can