4 quarts water
1 teaspoon salt
2 tablespoons apple cider vinegar
2 large onions, unpeeled and coarsely chopped
3 celery stalks, coarsely chopped
1 bunch fresh parsley
2-3 garlic cloves, lightly smashed
2-4 lbs. meat or poultry bones
Place all ingredients in a large slow cooker set on high. Bring to a boil, then reduce the setting to low for 12-24 hours.
The longer it cooks, the better it tastes! Strain the stock through a fine mesh strainer or coffee filter into a large bowl, and discard the waste.
If you don’t have a slow-cooker you can still reproduce this recipe on a stovetop, with a large pot on low heat.