She explained: "I did a really simple tomato sauce, I did one really big onion and I sweated that down with butter and olive oil, so it was really caramelised and golden and really sweet.
"It's the butter, you're cooking the onions down with the butter and it tastes fantastic, the tomato sauce, a bit of parmesan cheese... heaven." Shivi's recipe arrives just in time for World Pasta ...
Simple home tests can help detect adulteration in tomato ketchup. Common adulterants used in ketchup/sauce As per experts, one of the most common adulterants used in ketchup is formalin.