1.Boil, steam or microwave potatoes until tender; drain. Mash potato in a large bowl with milk and butter; season to taste.
2.Cook pork sausages in a heated oiled large frying pan, over medium heat until browned. Remove from pan. In same pan, cook onions stirring, until soft.
3.Return sausages to pan with red wine; bring to the boil. Reduce heat; simmer, uncovered, until liquid is reduced by a third. Serve sausages with red wine gravy and mashed potato.