Ingredients:

1 large nectarine, pitted and peeled, cut in ¼ inch slices
2 slices of rosemary focaccia, ½ inch thick
1 tablespoon unsalted butter, softened
2 slices fontina cheese
3 to 4 slices good-quality prosciutto
Freshly ground black pepper
Small handful fresh arugula

Instructions:

Preheat an electric panini maker to high.
Grill the slices of nectarine on the panini maker until marks appear, 30 seconds to a minute.
Do not let them get mushy!
Set aside to cool.
Spread the butter on one side of the sliced focaccia and place butter side down on a clean plate or cutting board.
Place a slice of fontina on the unbuttered side of on slice of bread and top prettily with the prosciutto and the cooled nectarine slices.
Add nice grind of fresh black pepper here, and the arugula.
Top with the other slice of fontina and then the other slice of focaccia, butter side up.
Place the sandwich on the panini maker and grill until the bread is golden brown and crispy, 2 to 3 minutes.
Cut in half and serve immediately.