Heat oil in a 4 ½-quart Dutch oven over medium-high heat. Brown meat in four batches and set aside.
3 tablespoons avocado oil
When finished, return all meat to Dutch oven and add apple cider, vinegar, and water. Cook, stirring to scrape bits off the bottom, until it comes to a boil.
2 cups apple cider or juice, 2 tablespoons apple cider vinegar, ½ cup water
Place chopped vegetables and apple in the bottom of slow cooker.
3 potatoes, 2 large carrots, 2 onions, 1 stalk celery, 1 apple
Pour meat mixture over top. Turn to low setting and cook for 6 to 8 hours or 3 hours on high.