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1. Heat the oil in a heavy soup pot or Dutch oven over medium heat. Add the onion and cook, stirring, until tender, about 5 minutes. Add the ginger and stir together until fragrant, about 1 minute. Add the squash, sweet potatoes, regular potato, and water or stock, and bring to a simmer. Add salt to taste, reduce the heat, cover and simmer 45 minutes, or until all of the ingredients are thoroughly tender.
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2. Using an immersion blender, puree the soup (or you can put it through the fine blade of a food mill or use a regular blender, working in batches and placing a kitchen towel over the top to avoid splashing). Return to the pot and stir with a whisk to even out the texture. Heat through, adjust salt and add pepper to taste.
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Advance preparation: You can make this a day ahead and refrigerate. Reheat gently. The soup freezes well. Once thawed, whisk well to smooth out the texture, and reheat.
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Nutritional Information per Serving: Calories: 189; Calories from Fat: 29; Total Fat 3.2g; Cholesterol: 0mg; Sodium,776mg; Total Carbohydrates,38.6g; Dietary Fiber, 5.7g; Sugars, 3.6g; Protein: 3.5g; Vitamin A 163%; Vitamin C 61%; Calcium 7%; Iron 8% (Approximate nutritional information provided by calorie-count.com)