Peel & clean the prawns, keep the heads & shells (leave the tails on if you like).

In a large pot sauté the chopped onion, carrot and celery in a little olive oil for 1 minute.

Add the prawn shells and heads and sauté for a further 2-3 minutes.

Add tomato paste and 400 mls (14 fl oz) of water.

Add 3-4 bay leaves and 6-8 peppercorns and bring to the boil.

Once boiling, lower heat to a simmer and continue to simmer until reduced by just over half.

In another pot boil enough salted water to cook the pasta in.

Cook the pasta until al dente (check the package).

Strain the pasta and cool with running water.

In a large fry pan, melt 2 tbsps butter with 2 tbsps olive oil over medium heat.

Sauté the diced onion, fennel and garlic until starting to turn translucent.

Turn the heat to high and add ¼ cup of Pernod.

Burn the alcohol off the Pernod and reduce until the pan is only slightly wet.

Remove from the heat.

Place the contents of the pan along with the cream into a large pot and return to medium heat.

Meanwhile once the prawn stock has reduced by half, strain it and discard the solids.

Add no more than 200 mls (7 fl oz) of the stock to the sauce and continue to reduce until thick (do not boil).

Once sauce is thick enough to coat the pasta, reduce to low heat.

Wipe the fry pan clean and melt 1 tbsp of butter with 1 tbsp of olive oil over high heat.

Add the prawns and cook for approx 2 minutes or until pink.

Splash with a few tbsps of Pernod, burn off the alcohol and add the contents to the sauce.

Add parmesan cheese to sauce, stir and season to taste with sea salt and black pepper.

Rinse pasta under hot water to warm up, shake off excess water and plunge pasta into sauce.

Stir gently and serve.

Garnish with excess fennel fronds if desired.