Core the apple and slice into 1/4-inch-thick round slices, slicing from the center of the apple to get even pieces. Coat the apple slices with lemon juice. Place down an apple slice as the base of the sandwich and top with 2 slices of turkey, 1 slice of cheese crisscrossed, 1 slice of bacon crisscrossed and 1/4 cup arugula. Top with another slice of apple and repeat with the remaining ingredients. Top with another apple slice. If transporting for an on-the-go lunch, wrap the sandwich tightly with plastic wrap and refrigerate until ready to eat.