You can get nutrients from the sauce. IMO tomato sauce is very tasty and can be pretty cheap as well. Probably the cheapest would be tomato paste and water as a base. Or canned tomatoes. Depending on how cheap you want to go you can add vegetables to your liking. Onions are always great but also carrots or peas.

Well, one could argue if just posting a link with a title is a ‘quality’ post. But the topic is still worth a discussion so I don’t see why it should be downvoted.

I think you should not downvote a post you have a negative opinion about. If the post is worth to discuss then why should I not upvote the post and then say that I disagree in the comments. If we all down vote those posts nobody will see it (apart of those who sort by controversial) and there will be no discussion.