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Ingredients
| white mushrooms: 1 lb (sliced) |
| salted butter: 4 Tbl |
| all-purpose flour (unsifted): 2 Tbl |
| chicken broth: 2 tsp |
| sour cream: 1 1/2 cups |
| lemon juice: 2 Tbl |
| garlic powder: 1 tsp |
| onion powder: 2 tsp |
| whole nutmeg: 1/2 tsp |
| fresh tarragon: 1/2 tsp |
| salt: 1/4 tsp |