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Heat olive oil in wide soup pot over medium-low heat. Add garlic and saute, stirring, until just golden on both sides, 1 to 2 minutes. Remove clove and discard. Add celery, leeks and chard stems. Sprinkle with 1/4 teaspoon salt and sweat, stirring occasionally, until softened but still with bite, 10 to 12 minutes, making sure not to achieve any color. Pour in stock and 1 cup water; bring soup to boil, then reduce to simmer. Add dill fronds and bay leaf and simmer over medium-high heat to infuse flavor in broth, about 10 minutes. Reduce heat to medium-low and add chard leaves in batches, cooking gently only until just wilted. Stir in 1/4 teaspoon salt and 1/4 teaspoon pepper. Let soup cool, and then refrigerate until ready to eat.