Apple and Fontina Grilled Cheese Recipe  INGREDIENTS: 16 slices cocktail pumpernickel bread ¼ cup tarragon Dijon mustard 8 ounces Fontina cheese, grated (about 2 cups) 16 baby spinach leaves ½ sweet-tart apple (such as Pink Lady), thinly sliced Kosher salt, freshly ground pepper ¼ cup (½ stick) unsalted butter, room temperature PREPARATION: Spread 8 slices of bread with mustard; top with half of cheese, thenContinue reading