Wash the leeks well and chop into small rings , reserve some of the rings
Peel the onions and the garlic and chop roughly
Add the leeks,onions, garlic, butter and saute, do not fry or brown them , dust with the flour until all is used and has slightly thickened the mixture .Add the vegetable stock slowly stirring all the time . Gently cook for about 15 minutes
Cool slightly .Puree all with a blender or food processor . Add half the cream , all brandy or sherry if using and season with pepper , salt parsley or coriander and Worcestershire sauce
Add the precooked crab meat just before serving with the rest of the cream and Leek cutting
