Oh sorry i presumed tomato paste was everywhere. Paste is a concentrated puree. If you can't get paste then puree is ok but will need more reducing to get the richness of paste in your bolognese.
Btw jars of tomato sauce for bolognese etc have loads of sugar in it. Read the labels.
And if you follow noblehead's cooking advice and like it, good for you and him, but i assure you, the guy doesn't have a clue about good cooking. Food should not reek of garlic. Properly cooked garlic has a subtle but distinctive flavour and you don't need a lot of it to get its benefits. You must sauté it first, not chuck in near the end. Doing it that way will possibly cause you reflux and stomach discomfort.
Re the people who want you to eat starch, there is a general slowness to come around to low carb for diabetes (and weight management) by some in the medical community. Its just because they haven't yet done much reading and its about moving from an old position to a newer one. There was has been a lot of debate about the diet since its early days but meanwhile those who promote it, have done quite a lot of studies disproving their concerns. Also others have done studies which disprove their concerns. The only studies that have not yet been done are long term ones that may show up other factors to worry about or otherwise, show what a great diet it is. I'm currently reading a book which is arguing that the whole nutrition science field is pretty hopeless. But anyway you would find it of great benefit to read some decent books about low carbing if you are going to follow this diet. You owe it to yourself to understand a bit. Dr Atkins is a very easy read and although its a bit promotional, i think it would be a good book for someone new to low carb to read first. It will also help you a lot with how you manage your diet. But bear in mind, doing the whole induction route is not essential, although it helps if you want to burn fat for energy rather than carbs. you can usually find his books in secondhand book shops. And there is a website on it.
There are also some great low carb recipe books around. Check out your local library.