Melt the margarine in a pot over medium heat. Add the sliced onions and sugar.
Saute until the onions are softened and transparent. Sprinkle in the flour gradually and saute the onions, stirring constantly, for about three more minutes.
Add the vegetable broth and water. Bring to a boil, then lower the heat and simmer for 10 to 15 minutes. Serve immediately.
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