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| salted butter: 1/4 cup |
| onions: 1 (chopped) |
| ground beef: 2 lbs |
| eggs: 2 |
| salt: 1 tsp |
| black pepper: 1/2 tsp |
| fresh tarragon: 1/4 tsp |
| dried marjoram: 1/4 tsp |
| all-purpose flour (unsifted): 2 1/2 Tbl |
| canned tomato paste: 5 1/2 Tbl |
| beef stock: 3/4 cup |
| worcestershire sauce: 4 tsp |
| distilled vinegar: 2 tsp |
| white mushrooms: 0.5 lb (sliced) |
| sour cream: 1 cup |
Credit: Food.com