Cook the pasta in plenty of salted water with the oil according to the instructions on the packet until al dente. Then drain and drain well in a colander.
While the pasta is cooking, roughly slice the parmesan. Put the cream in a saucepan and reduce it by half. Whisk the egg yolks with 3 tablespoons of hot cream. Then add to the cream and stir until a slightly creamy sauce is formed.
Layer the pasta with parmesan and cream sauce in a preheated bowl. Slice the truffle, then fold in well and serve immediately.