In a pan, sauté oil, an unpeeled garlic clove and a piece of chilli pepper. As soon as the garlic turns golden, remove it and moisten with a bit of stock, bring to the boil then turn off the heat.
In the meantime, open the raw clams with a small knife, and recover their water.
Cook the pasta in plenty of boiling salted water, sauté the spiny lobster and squid in a hot pan with oil and cut into regular pieces, then season them with parsley, tomatoes cut into strips, oil, salt, pepper and a few drops of lemon juice.
Drain the pasta very al dente and finish cooking in the guazzetto stock, finally add the clams with a bit of their water. Stir well with oil and a pinch of chilli pepper.
For the dry mushroom oil:
seal the ingredients in a sous-vide plastic bag and let infuse at 63° C for 24 hours.
Serve the pasta arranging the pieces of fish on top and finish by seasoning with the mushroom oil and a few parsley sprouts.