Pop it all in a pan. Simmer for 10 minutes together to bring the natural sugars in the tomatoes out, and then pop into jars. It’s actually that simple. You could add sa pinch of paprika or turmeric. You could blitz 2 tablespoons of herbs and a clove of garlic to give a bigger flavour, but sometimes, a simple smooth sauce is just the thing that’s called for – especially when trying to wean kids!