Ingredients
- 4 tbsp. unsalted butter
- salt
- Freshly ground pepper
- 1 c. chicken stock
- 2 tbsp. extra-virgin olive oil
- 1 tbsp. Dijon mustard
- 1 large onion
- 1¼ lb. beef tenderloin
- ½ c. Crème fraîche
- 2 tbsp. cognac
- 1 lb. white mushrooms
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