Preheat the oven to 170°C.
Bring the water to the boil in a large pot, adding the salt once the water is rolling.
Add the pasta and cook according to the directions on the packet.
Meanwhile, dice the shallots and crush the garlic.
Heat the EVOO in a shallow pan, and fry the shallots and garlic until fragrant and just browning. Add two ladles of the hot pasta water to the pan to deglaze.
Tip this mixture into a casserole dish, add the pasta.
Grate all the cheeses in the Thermomix bowl 15 sec/speed 10. Stir through the hot pasta. Season with pepper and drizzle generously with cream. Cover with foil and bake 15 minutes.
Remove the foil and stir through the salmon, breaking up the salmon as you go. Add plenty of dill at the same time.
Serve immediately with more dill for garnish, a small spoon of caviar and lemon wedges on the side.