This is a nice and simple yet tasty tomato sauce.
Take a small (or half a large onion) and dice finely.
Take half a red pepper and dice finely.
Soften the onion and pepper in a large frying pan with a splash of olive oil.
When the onion and pepper are nearly cooked you can add some chopped mushrooms (but this is optional, however they do add a really nice flavour).
Once the mushrooms are cooked add a good splash of balsamic vinegar and turn up the heat.
Now add a tin of chopped tomatoes or passata. I usually just use a tin of chopped (or whole) tomatoes and then whizz it in a blender. Add some tomato puree and cook for at least fifteen minutes.
It goes well with a lot of dishes, meat, fish or vegetarian.
I served mine with plain rice and thin pork loin steaks which I had covered in flour, then egg and then breadcrumbs and shallow fried.