The secret to making a truly good crockpot tomato basil soup always lies with the unique blend of ingredients in the broth. Give it enough time to simmer and combine, and you’ll always end up with a tasty dish. By using a crockpot, you can achieve all of that without having to spend hours watching your soup. The key to this recipe is the two types of tomato-based ingredients—plum tomatoes and tomato puree. When combined with the garlic and onion and other herbs, you get a full-bodied soup that can serve as a light dinner or a heavy snack especially with some paleo bread alternatives.