If making mashed potatoes for this dish, start by skinning your potatoes, chunking them up, placing in a pot, cover with water, salt the water, and bring to a boil over high heat. You can also use leftover mashed potatoes.
4 russet potatoes
Once potatoes are soft, strain off the water. Return the potatoes to your pot and add the butter. Mash potatoes with butter until incorporated, then mash in buttermilk.
4 Tbsp butter, 1/2 cup buttermilk, salt & pepper to taste
Bangers & Gravy
Heat oil in skillet over medium high heat, add sausage and beer. Cover skillet and cook 10 minutes. If using uncooked Bratwurst, cook over medium heat. If using cooked sausages, simmer on low heat.
While sausage simmers, caramelize your onions with butter to golden brown (5-10 minutes). Once onions are brown, sprinkle with flour and cook for 2-3 minutes.
1 medium onion, thinly sliced, 2 Tbsp flour
Once flour has cooked, add stout beer and deglaze the pan, scraping up all the crusty bits into the gravy. Add the beef broth and simmer until no longer foamy (10-15 minutes). Season with Worcestershire sauce and Greek seasoning.
1 cup stout beer, 1 cup beef broth, 1 Tbsp Worcestershire Sauce, 1-2 tsp Greek seasoning
Assembly
To build this dish, scoop mashed potatoes onto your plate, top with a sausage and a nice scoop of stout onion gravy.
Notes
This recipe would be a great way to use up leftover mashed potatoes, but you can make them yourself using my easy mashed potato recipe.If you would prefer a more authentic Bangers & Mash, skip using the Worcestershire and Greek seasoning.