In a large saucepan of boiling salted water, cook the pasta for 8 to 10 minutes or until it is al dente, and drain it well. In a medium saucepan, heat the butter until melted, add the snow peas and asparagus and cook for one minute. Add cream, cheese and pasta and simmer until sauce thickens and mixture is combined well. Finish with a sprinkle of salt and pepper and Parmesan cheese to taste. Serve garnished with tomatoes. Serves 2.