Mushroom Wine Sauce - cooking recipe

Ingredients

2 Tbsp. butter
2 Tbsp. flour
1 c. chicken stock
1/2 c. dry white wine
1/2 tsp. tarragon
salt and pepper
4 oz. can mushroom pieces or 1/4 lb. fresh, sliced and sauteed for 5 minutes in butter
1/2 c. half and half
1 egg yolk

Preparation

Melt butter in saucepan and add flour.
Cook, without browning, stirring constantly, for several minutes.
Slowly add stock, wine and spices. Simmer several minutes and add mushrooms. Simmer for 5 minutes. Remove from heat and stir in creamed mixed with egg yolk.
Cook, stirring, until heated through. Do not let boil.
May be made a day ahead and reheated.