Sweat the chopped shallots in butter in a pan along with the whole garlic clove, then deglaze the juices with the dry white wine. add the thyme, bay, parsley and freshly ground pepper. Cook for one or two minutes with the lid on. add the mussels and cook for a few minutes on a very hot flame with the lid on. shake the pan occasio- nally until all the mussels are cooked and have opened. Strain the mussels keeping the cooking liquid on one side shell the mussels.
Sweat the shallots in butter in a pan, then deglaze the juices with the white wine. reduce the liquid slightly. Add the fish stock and bring to a simmer. When the liquid is simmering cook the fish and shellfish. Cook each category separately and remove when cooked. add the precooked prawns to the other cooked fish. Keep them warm.
Add the cooking liquid from the mussels to the cooking liquid from the fish and then reduce it by three quarters. Thicken with a little “beurre manié” (uncooked butter and flour kneaded together to form a paste). Add the cream. Bring back to the boil. Check the seasoning. sieve and liquidize the sauce to lighten it.
Cook the asparagus, the leeks, the peas and broad beans in salted water and then refresh under cold water. Glaze the carrots.
Place all the fish and shellfish in the casserole. add the vegetables. Pour over the hot sauce. Sprinkle with the fresh herbs.