A good marinara sauce is an essential for everyone. I love this one because you just dump the ingredients into a slow cooker then leave it to work it's magic. The slow cooking caramelises the sugar in the tomato and creates a depth of flavour you will never get from store bought pasta sauce.
1. I like my marinara sauce smooth so I whizz it up with a hand held blender once it's finished cooking. Because I whizz it up, I can use either crushed or diced tomato. But if you don't plan to puree it, I strongly recommend using crushed rather than diced tomato because otherwise the sauce will be quite chunky - in my personal opinion, it is too chunky which means it doesn't coat the pasta as evenly and also doesn't spread as well for things like lasagna and cannelloni.
2. This sauce can be kept in the refrigerator for 1 week or freezer for 3 months.