Start by preparing the rocket pesto. In a blender, combine all the ingredients and blend until you get a smooth mixture. Cut the Provolone Dolce into slices and the cucumber into rounds and set aside. Build the sandwich by making a layer of pesto on the base, place the bresaola and the slices of Provolone Dolce. Add the sliced cucumber and a drizzle of extra virgin olive oil and a pinch of pepper. Close the sandwich and serve.