Boil the butter in a thick bottomed pan

Add the onions and carrots

Mix In the flour and cook

Gradually add the hot stock

Stir the boil

Add the bouquest garni and season lightly

Simmer for approximately 1 hour

Remove the bouquest garni and mirepoix

Liqudise or pass firmly through a conical strainer

Return to a clean pan correct the seasoning

Serve fried or toasted croutons separately