Making a batch of hidden veg tomato sauce is a terrific way of getting lots of great stuff into the kids. It's unbelievably yummy and can be used in a lot of ways– spread it on homemade pizza, enjoy it with pasta, thin it down to make a stunning soup, or try baking it over a piece of chicken or fish– it's up to you. Even better, you can mix up the veg depending on what's in…