6 unpeeled carrots, cut into thirds
2 unpeeled yellow onions, cut into chunks
1 leek, white and green parts, cut into thirds
1 bunch celery, including the heart, cut into thirds
4 unpeeled red potatoes, quartered
2 unpeeled Japanese or regular sweet potatoes, quartered n 1 unpeeled garnet yam, quartered
5 unpeeled cloves garlic, halved
1⁄2 bunch fresh flat-leaf parsley
1 8-inch strip of kombu
12 black peppercorns
4 whole allspice or juniper berries
2 bay leaves
8 quarts cold, unfiltered water
2 teaspoons sea salt

DIRECTIONS:

1. Rinse all of the vegetables well, including the kombu. In a 12-quart or larger stockpot, combine the carrots, onions, leek, celery, potatoes, sweet potatoes, yam, garlic, parsley, kombu, peppercorns, allspice berries, and bay leaves. Fill the pot with the water to 2 inches below the rim, cover, and bring to a boil.

2. Remove the lid, decrease the heat to low, and simmer for at least 2 hours. As the broth simmers, some of the water will evaporate; add more if the vegetables begin to peek out. Simmer until the full richness of the vegetables can be tasted.

3. Strain the broth through a large, coarse-mesh sieve (remember to use a heat-resistant container underneath), then add salt to taste.

4. Let cool to room temperature before refrigerating or freezing.
   
   From The Cancer-Fighting Kitchen: Nourishing, Big-Flavor Recipes for Cancer Treatment and Recovery by Rebecca Katz with Mat Edelson.