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| chicken breasts: 2 lbs |
| all-purpose flour (unsifted): 1/2 cup |
| salted butter: 3 Tbl |
| olive oil: 2 Tbl |
| shallot onions: 4 (minced) |
| garlic: 2 cloves |
| white mushrooms: 0.25 lb (sliced) |
| red wine vinegar: 1/2 cup |
| fresh tarragon: 1/2 tsp |
| canned tomato paste: 3 Tbl |
| sour cream: 1 cup |
| granulated sugar: 1 Tbl |
Credit: Food.com