Source: Symposium Mediterranean Restaurant, Lancaster, Pennsylvania
Serves 6
1/4 pound butter
1 medium Spanish onion, diced
1 1/2 cups portabella mushrooms, sliced
1 bunch fresh tarragon, chopped
1/2 cup dry vermouth
2 tablespoons flour
1 quart heavy cream *
1 cup crumbled Gorgonzola or blue cheese
Salt and pepper, to taste
Melt butter in a 3-quart pan, and saute.