Slow Simmered Chicken Broth with Vegetables

Ingredients

• 6 unpeeled carrots, cut into thirds
• 2 unpeeled yellow onions, cut into large chunks
• 1 bunch celery, including the hearts, cut into thirds
• 4 unpeeled red potatoes, quartered
• 2 unpeeled sweet potatoes, quartered
• 8 unpeeled garlic cloves, halved
• 1 bunch flat-leaf parsley
• (6-inch) strip of kombu
• 12 whole black peppercorns
• 4 whole allspice or juniper berries
• 2 bay leaves
• 1 tablespoon vinegar (preferably apple cider or white wine vinegar)
• 1 organic chicken carcass or 2 pounds of chicken bones
• 8 cups cold filtered water plus more as the broth cooks
• 1 teaspoon sea salt