Core the tomatoes then cut a cross on the opposite end from the core (this will help the skin peel eventually).
Plunge into boiling water to blanch for 12-15 seconds.
Remove with a slotted spoon and cool in iced water.
Peel, and squeeze out any excess moisture, then dice, and reserve.
Heat the olive oil in a frying pan. Add the shallot, garlic and chilli, and cook over a moderately low heat until soft, but not browned for about 1-2 minutes.
Then add the tomatoes to break them down
Add the crabmeat and cook for 30 seconds.
Add the white wine and increase the heat to deglaze the pan (i.e removes anything stuck to the bottom of the pan).
Leave the sauce to reduce while cooking the pasta.
Cook the tagliatelle in boiling salt water according to the packet instructions
Melt the butter with 2 ½ tablespoons of water in a large saucepan. Drain the pasta and place in the pan of butter and water. Toss to coat.
Add half the parsley to the pasta and half to the sauce.
Serve the pasta onto a plate then spoon the sauce around the outside, and garnish each serving with a sprig of chervil.
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