Preheat the oven to 450^F. Put the cut vegetables in a heavy baking pan. Roast in the oven, uncovered, stirring occasionally, for about 1 hour. Transfer the vegetables to a stockpot. Cover with 2 litre water. Bring to a boil and simmer, covered, for 1 hour. Strain. Cool to room temperature and refrigerate for up to 4 days or freeze for up to 1 week. Makes 4 cups. From Eat More, Weigh Less by Dean Ornish, M.D. Formatted for MM:dianeE