Pull the kale and chard leaves from the stems and set the leaves aside. Chop off and discard the woody ends of the stems. Slice the remaining stems ½-inch thick.
Heat the oil in a large soup pot over medium-high heat. Add the sliced stems, onion, celery, carrot and fennel bulb, sprinkle with 2 teaspoons of the salt, and sauté for about 10 minutes, until the vegetables begin to soften.
Add the garlic and sauté for about 2 minutes, stirring often so it doesn’t brown.
Add the rutabaga and parsnips, sprinkle with the remaining 2 teaspoons of salt, and sauté with the other vegetables for about 10 minutes to begin to soften them. Add 2 quarts of water, the tomatoes, thyme sprigs, bay leaves and cheese rind. Increase the heat to high and bring the water to a boil. Reduce the heat to maintain a gentle simmer and cook the soup, stirring occasionally, for about 1 hour, adding another quart of water during that time, until the vegetables are very soft.




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