Butter one side of each slice of bread. Place half of the bread slices buttered side down, and cover them with the cheese, folding them over if they extend past the edges of the bread. Place the top slice of bread over the cheese, buttered side up. Grill the sandwiches in a moderately hot skillet or panini grill until the bread is golden brown and the cheese has melted. Cut each in half on the diagonal to serve.
Recipe courtesy of Nancy Silverton
Makes 4 Sandwiches