Gather ingredients and set STOK grill to high heat.
Meanwhile make the mash potatoes. Cut potatoes into large pieces add to STOK Kettle insert along with water. Bring to a boil.
Coat sausages in olive oil and place on heated grill. Turn every fifteen minutes and cook until fully colored: about 30-40 minutes. Cook until tender.
Drain water and add potatoes back to insert. Add milk and butter and mash. Place on low heat and cover.
On the separate side of the grill, begin making the gravy. Melt butter and 1 tablespoon olive oil. Next add onions and cook until they are soft. Mix in vinegar, red wine and beef stock and bring to a boil.
Once gravy come to a boil, reduce heat and simmer for about 10 minutes.
Remove Bangers and Mash, serve with gravy and enjoy!