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Wash and dry all produce. Adjust rack to middle position and preheat oven to 400 degrees. Mince or grate garlic. Using a vegetable peeler, shave zucchini lengthwise into ribbons, rotating until you get to the seedy core. Dice seedy core. Quarter and peel shallots. Halve tomatoes. In a medium microwave-safe bowl, combine stock concentrates and 3 cups water. Microwave on high for 1 minute.