Grilled Cheese Sandwich

Directions

1. 1
   In a heavy medium skillet, melt the butter over high heat. When the butter begins to brown, add the mushrooms and toss to coat.
2. 2
   Saute, stirring occasionally, until the mushrooms have browned around the edges, 2 to 3 minutes.
3. 3
   Add the green onions and cook for 1 minute longer. Transfer the mushrooms to a plate and season with salt and pepper.
4. 4
   Divide the cheese among 4 slices of bread.
5. 5
   Top each with the mushrooms, leaving about 1/4-inch from the edge of the bread. Add a tarragon sprig and cover with the remaining 4 slices of bread.
6. 6
   Preheat a cast-iron ridged griddle or skillet for 10 minutes over moderate heat. Grill the sandwiches for 4 minutes per side or until the bread is lightly browned and the cheese has melted.
7. 7
   Serve halved as a first course or quartered as an hors d'oeuvre.