Aunt Effie's Oyster Stew
Ingredients:
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3 cups water
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1 large potato, peeled and cut into 1/2-inch cubes
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¼ cup butter
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⅓ cup all-purpose flour
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⅓ cup water
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2 (8 ounce) cans oysters with liquid
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3 cups whipping cream
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1 cup sliced fresh mushrooms
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¾ cup powdered milk
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4 teaspoons salt
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4 teaspoons Worcestershire sauce
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water, as needed