Heat oil in a large skillet over medium-high heat. Add the onion and saute until it begins to turn clear (5-8 minutes). Add cabbage, apples, vinegar, and caraway seeds and stir to combine. Place sausage links and potatoes on top of the cabbage mixture, season with salt & pepper, and pour the beer over top. Bring to a boil over medium-high heat, then reduce to a low simmer. Cover and simmer for about 30 minutes. Serve with local, organic Blackwell Roots Sauerkraut and local mustard (see Aisle 3).