Squeeze the sausages out of their skins and fry them over a medium heat to get some colour, then remove from the pan, leaving as much fat as you can.
Finely slice the onions and add them to the pan over a low heat, cooking them gently until they are caramelised and lovely.
Chop the tomatoes using scissors in the tin and pour them over. Add the sausages back in with a little water and gently braise them until they are really soft and the sauce tastes great. Season to your tastes.
Make your pizzas with the sauce, mozzarella and chopped peppers.
Bake for around 15 minutes until piping hot with bubbling cheese.