Prosciutto, Brie and Apple Panini with Scallion Butter

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Ingredients

1. 4 tablespoons plus 2 teaspoons unsalted butter, softened
2. 1 scallion, finely chopped
3. 1/2 teaspoon fresh lemon juice
4. 1/4 teaspoon Dijon mustard
5. 4 soft hero or ciabatta rolls, or 1 long baguette, halved lengthwise
6. 3/4 pound thinly sliced prosciutto
7. 1/2 pound Brie, rind removed, cheese cut into 4 pieces
8. 1 large Granny Smith apple—peeled, cored and thinly sliced

1. In a bowl, beat 4 tablespoons of the butter until creamy. Stir in the scallion, lemon juice and mustard until smooth.
2. Preheat a griddle over low heat. Spread the scallion butter on the cut sides of the rolls. Lay the prosciutto on the bottom halves; top with the Brie and the apple slices and close the sandwiches. Lightly spread the remaining 2 teaspoons of butter on the outside of the rolls (it will be a very thin layer).
3. Put the sandwiches on the griddle. Cover with a heavy skillet and cook over low heat, turning occasionally, until toasted and the Brie is melted, 10 minutes. Cut the panini in half and serve.