Cleaning porcini mushrooms. For large mushrooms remove the sponge. Clean porcini carefully with kitchen paper or a brush. Peel the stalks thinly if necessary. Slice small mushrooms, cut large ones into pieces.
Clean, wash and cut the spring onions into rings. Dice bacon. Wash the thyme, dab dry and remove the leaves. Cook the noodles in boiling salted water for about 8 minutes. Heat oil and fry bacon.
Add porcini mushrooms and fry for 3-4 minutes, turning. Add spring onions and thyme, fry briefly. Dust with flour and sauté while stirring. Add wine, stock and cream while stirring. Let simmer for 2-3 minutes at a mild heat.
Drain the pasta. Season sauce with salt and pepper. Serve the pasta with the ragout.