Scald the oysters in their liquor until plump. Put into a saucepan two tablespoonfuls of butter; when melted stir in carefully the flour, and cook, but not brown. Stir in slowly the oyster juice; when perfectly smooth add the milk or cream and the seasoning. Take it off the fire, and when a little cooled stir in the beaten yolks. Place again on the fire, and stir until thickened; then pour it over the oysters on a hot dish. Place a border of triangular-shaped croutons around the dish, and serve at once. Do not add the cream and eggs to the sauce until time to serve, so that there may be no delay, as this dish is not good unless hot, and if kept standing the sauce will curdle. The sauce should be of the consistency of cream.