INGREDIENTS
1 3/4
to 2 pound piece of beef tenderloin (preferably a piece cut from the center of the tenderloin), trimmed of excess fat and silverskin
1 tsp
kosher salt
1/2 tsp
coarse black pepper
1 1/2 tbsp
olive oil
1 lb
cremini mushrooms, sliced into 1/8 to 1/4-inch thick slices
3 tbsp
butter
1 tsp
salt (use 1/2 teaspoon if using salted butter)
2 tbsp
minced shallots
2 tbsp
minced garlic
1 1/2 tsp
herbs de provence or a teaspoon of dried tarragon