I want to experiment with various marinades the first time, and I've found great recipes but some of them require the use of ketchup.
While it sounds awesome, I find it unhealthy and prefer not to buy ketchup only for the sake or marinades. Can I achieve the same with natural tomato puree? If yes, what other spices should I consider for the same effect?
If the question is vague: I want to cook pork, mostly.