Fontina, Prosciutto Panini with Arugula Pesto and Pickled Shallots

Probably the best grilled cheese sandwich of my  ENTIRE life — hits all the notes: cheesy and creamy (fontina), salty (prosciutto), herby (arugula pesto), and pickle-y (pickled shallots). YUM! For the Sandwich ¼ cup cider vinegar 2 tablespoons sugar 1/2 teaspoon salt 1 large shallot, thinly sliced 1 loaf ciabatta, sliced lengthwise 1/3 pound prosciutto (about 10 slices) […]