Peel potatoes and slice in half. Chop each half into thirds. Next, peel the garlic and roughly chop the apple.
Slice the onion, and mix with the potatoes. Sprinkle with salt, pepper, and crushed red pepper. If using caraway seeds, add them too. Slice the sausage on the bias (at an angle).
Select the saute setting on your pressure cooker/Instant Pot. Add diced bacon until some of the fat is rendered (if it's too lean, add 1 tablespoon oil)
Add the potatoes and onions and sauté until they begin to brown (approximately 3 minutes). Next, add the sausage and garlic and saute a few minutes longer.
Add the chopped apple to a bowl, along with the brown sugar, sauerkraut, and 6 ounces of beer. Stir the contents of the bowl and add to the Instant pot/pressure cooker.
Lock the lid and seal the vent. Pressure cook for 5 minutes. It will take approximately 5 minutes to seal and start counting down. Natural release for 3 minutes.
Carefully remove the lid and gently stir the sausage, potato, apple, and sauerkraut mixture before serving.