Place the live lobster in a sink of blood heat water (it is at this temperature that scientists say that all edible shellfish die with the least discomfort). Remove from water and crack open and take out flesh (usually 5 ounces from a 1 1/2 pound lobster). Reserve the shell. Heat a serving platter in the warming oven - preheat oven to 300 degrees F. Put both pike and lobster flesh through a mincer with a very fine screen. Keep the flesh in a bowl set in another bowl of rice. Into a frying pan, place some clarified butter and add the onion and garlic clove - pop in the lobster shells and simmer gently. Add 1 ounce of brandy and set it alight. Pour in the 1 cup of dry white wine, cover and continue cooking over a low heat.
Put the blanched mushrooms through the mincer and then add to the chilled fish flesh. Carefully blend in the 1 cup of whipping cream and season generously with freshly ground salt and pepper. Beat the 2 egg whites in a bowl and fold into the fish. Pour this mixture into 2 separate moulds and set them in a "bainmarie" (bath of hot water) and cover the molds with foil. Place in the preheated oven for 30 minutes - remove the foil after this period and cook uncovered for another 30 minutes. Strain the stock from the lobster shells, approximately 3/4 cup should be left, pour into a heated pan - increase the temperature and add the sliced tomatoes - simmer. Remove the baked fish molds from the oven and unmold onto the heated serving platter. Sieve the tomato stock mixture - pushing through as much tomato flesh as possible. Add the 2 egg yolks to the sieved stock (off the heat). Blend the arrowroot with the extra tablespoon of whipping cream and then add the mixture to the stock mixture for thickening. Return to the heat and allow the sauce to thicken - it shouldn't boil. Pour the sauce over the fish molds - dust with the chopped parsley and serve.
Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.