Mushroomy Pasta

1. cook the pasta in boiling, salted water until al dente. drain and return to the pan. meanwhile, heat the oil and butter in a large frying pan, add the mushrooms and cook over a high heat for about 8-10mins, stirring, until deep golden.
2. add the garlic and nutmeg, and season well with salt and black pepper. stir in the pesto and creme fraiche and heat gently. if the sauce is quite thick, add a splash of pasta cooking water.
3. add the mushroom mixture and parmesan to the pasta and toss together. serve with torn basil.