Serve this sauerkraut over the New York City Hot Dog.
Heat oil in a medium saucepan over medium-high heat. When oil shimmers, add onions and salt and cook, stirring occasionally, until onions are soft and translucent, 3 minutes.
Add cabbage, apple cider vinegar, apple cider, and 1/2 cup water to saucepan and stir to combine. Bring to a boil, cover, reduce heat, and simmer until cabbage is tender, 30-35 minutes.