5 Tbsp butter
1 pound of top sirloin or tenderloin, cut thin into 1-inch wide by 2 1/2-inch long strips
1/3 cup chopped shallots (can substitute onions)
1/2 pound cremini mushrooms, sliced
Salt to taste
Pepper to taste
1/8 teaspoon nutmeg
1/2 teaspoon of dry tarragon or 2 teaspoons of chopped fresh tarragon
1 cup of sour cream at room temperature