To a Dutch oven or large pan over medium heat, melt the butter, oil and brown the sausages evenly. They don’t have to be completely cooked. Remove and set aside.
Add the bacon and onion to the same pan and cook until the onions are softened, about 10 minutes. Stir in the garlic and mustard, cook for 1 minute, stirring. Sprinkle in the flour and stir, cook for 1 minute. Stir in the beer and cook for a couple of minutes until reduced slightly. Add the stock, apple juice, potatoes, rosemary, thyme and bay leaf. Bring to a light boil and partially cover for 15 minutes until the potatoes are just lightly softened.
Add the apple slices and cooked sausages to the pan and cook with the lid on for a further 10 minutes over low heat until the apples are soft and potatoes fully cooked.
Season to taste with salt, pepper to taste. Serve warm with chopped parsley.
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Notes
*Note: Popular brands are Paulaner, Lowenbrau and Spaten