Sausages, mash, onion gravy with veg

Fry the sausages in a pan and then set aside when done.  Melt butter in pan and add sliced onions.  Cover and cook for 10 mins until softened.  Meanwhile make your mashed potatoes. Uncover the onions and add a teaspoon of sugar and cook for about 20 mins until golden and the liquid has gone.  Add a tablespoon of flour, a sprig of thyme, and about 400ml of stock to the onions.  Bring to the boil and then simmer for 5 mins.  Add a splash of Cornish relish, season, and serve.