Dice the onion and pepper. Heat a little olive oil in a skillet/frying pan and add the onion. Cook, stirring now and then, for around 5min until it is softening but not burning - add a little more oil if needed. Add the pepper and cook another couple minutes.

Meanwhile remove the casing from the sausages. Add it to the pan, breaking it up as you go with a wooden spoon. Stir regularly so the sausage browns all over.

Add the pasta, tomatoes and water. Cover and bring to a boil, reduce to a simmer then leave to cook until the pasta has cooked (around 8min, depending on your pasta).

Once the pasta has cooked, stir in the yogurt and parmesan, mix in well then serve with a little more parmesan on top.