Preheat the oven to 400ºF.
Combine the shallots and Champagne in a medium-size saucepan over medium heat and reduce the mixture to a glaze. Add the butter cubes slowly, whisking constantly until they are all melted. The sauce will thicken slightly. Strain through a fine-mesh strainer into a medium-size sauté pan. Season with salt and pepper. Set aside and keep warm.
Bring the salted water to a boil in a large saucepan. Add the pasta and cook until tender, 2 to 3 minutes. Drain. Toss the pasta in a large mixing bowl with 1 teaspoon of the olive oil. Season with salt and pepper.
Heat the remaining 2 tablespoons olive oil in a large ovenproof sauté pan over medium heat. Season the prawns with salt and pepper. Sear them for 2 minutes on each side. Transfer the pan to the oven and bake for 3 to 4 minutes.
Carefully fold the salmon roe into the Champagne sauce. Toss the pasta with the sauce.
To serve, divide the pasta into equal portions. Twirl into nests and place in the center of dinner plates. Arrange the prawns around the pasta, sprinkle with the cheese and parsley, and serve.
Yield: 4 to 6 servings