INGREDIENTS
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4 tablespoons butter
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1 cup minced onion or white of leek
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¼ cup flour
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1 cup hot chicken stock
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6 cups milk
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1 quart fresh mushrooms, trimmed, washed, and diced
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¼ teaspoon dried tarragon leaves
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½ cup or more heavy cream, sour cream, or creme fraiche optional
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Salt and freshly ground white pepper
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Drops of lemon juice, optional
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Sprigs of fresh tarragon or slices of sautéed fresh mushroom caps, for garnish