Soak mushrooms in water for 1 hour and then chop into bite size pieces

Preheat oven to 300 degrees

Brown all sides of roast in oil over MEDIUM HIGH heat; set aside

Turn heat to MEDIUM, add butter, shallots and salt for 5 - 6 minutes until turning golden brown

Deglaze pan with vinegar

Add chicken broth, mushrooms, salt and pepper, cream and mushroom liquid

Roll beef in the sauce and then roast until reaches temperature of 120 degrees, about 45 minutes; let rest for 10 minutes

Heat sauce on HIGH until desired thickness

Turn OFF heat and add butter, swirling until melted

Add tarragon and test for seasoning