Zucchini Fenchel Suppe (Zucchini and Fennel Soup)
Ingredients:
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2 tablespoons butter
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1 onion, finely chopped
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1 bulb fennel, diced, green tops reserved
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1 zucchini, peeled and thinly sliced
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2 cups chicken stock
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1 teaspoon mild curry powder
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salt and freshly ground black pepper to taste
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1 teaspoon white wine vinegar, or to taste