Chicken sausage with a quick homemade sauerkraut

Ingredients

• 1 12-ounce package chicken sausage
• 1 teaspoon extra-virgin olive oil
• 1 small onion, sliced
• 1 Granny Smith apple, thinly sliced
• 1 10-ounce package shredded cabbage, preferably finely shredded
• 1/4 cup cider vinegar
• 1/4 teaspoon salt
• 1 cup apple cider
• 1 teaspoon caraway seeds